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{{Update|date=October 2020}}
{{Infobox recurring event
{{Infobox recurring event
| name = National Dark-Sky Week (NDSW)
| name = International Dark Sky Week
| native_name =
| native_name =
| logo =
| logo =
| logo_caption =
| logo_caption =
| image =
| image =
| caption =
| caption =
| status = Active
| status = Active
| genre = Astronomy-related events and competitions
| genre = Astronomy-related events and competitions
| date =
| date =
| begins =
| begins =
| ends =
| ends =
| frequency = Week of the [[new moon]] in April
| frequency = Week of the [[new moon]] in April
| venue =
| venue =
| location = Worldwide
| location = Worldwide
| country =
| country =
| years_active =
| years_active =
| first = 2003
| first = 2003
| founder_name = Jennifer Barlow
| founder_name = Jennifer Barlow
| last = 2015
| last =
| prev =
| prev =
| next =
| next = April 2025
| participants =
| participants =
| attendance =
| attendance =
| area =
| area =
| budget =
| budget =
| patron =
| patron =
| organised =
| organised =
| filing =
| filing =
| people =
| people =
| member =
| member =
| website = http://www.darksky.org
| website = https://www.darksky.org
| footnotes =
| footnotes =
}}
}}
[[File:Earth in nights.jpg|thumb|Composite image of the Earth's visible light pollution]]
[[File:Earth in nights.jpg|thumb|Composite image of worldwide light pollution at night]]

'''National Dark-Sky Week''' ('''NDSW'''), held during the week of the [[new moon]] in April,<ref name=WG>{{cite web |url=http://www.wisegeek.com/what-is-national-dark-sky-week.htm |title=What Is National Dark Sky Week? |author=<!--Staff writer(s); no by-line.--> |website=Wise Geek |publisher=Conjecture Corporation |accessdate=25 December 2013}}</ref> is a week during which people worldwide turn out their lights in order to observe the beauty of the [[night sky]] without [[light pollution]]. This event was founded in 2003 by high school student Jennifer Barlow of [[Midlothian, Virginia]] and its popularity and participation increases every year.<ref>{{Cite web|title = Jennifer Barlow: Dark-sky Devotee - Sky & Telescope|url = http://www.skyandtelescope.com/astronomy-resources/jennifer-barlow-dark-sky-devotee/|website = Sky & Telescope|accessdate = 2015-12-06|language = en-US}}</ref> It has been endorsed by the [[International Dark-Sky Association]] (IDA), the [[American Astronomical Society]] (AAS), the [[Astronomical League]], and ''[[Sky & Telescope]]'' (''S&T'').<ref name="S&T">{{cite web |url=http://www.skyandtelescope.com/resources/darksky/3307451.html |title=Jennifer Barlow: Dark-sky Devotee |last=Bobra |first=Monica |work=[[Sky & Telescope]] |publisher=Sky Publishing of New Track Media}}</ref>
'''International Dark Sky Week''' (formerly the '''National Dark Sky Week''') is held during the week of the [[new moon]] in April,<ref>{{Cite web|url=https://www.darksky.org/dark-sky-week-2020/|title = Home}}</ref><ref name=WG>{{cite web |url=http://www.wisegeek.com/what-is-national-dark-sky-week.htm |title=What Is National Dark Sky Week? |author=<!--Staff writer(s); no by-line.--> |website=Wise Geek |publisher=Conjecture Corporation |access-date=25 December 2013}}</ref> when people worldwide may turn off their lights to observe the beauty of the [[night sky]] without [[light pollution]]. This event was founded in 2003 by high school student Jennifer Barlow of [[Midlothian, Virginia]].<ref>{{cite web |title=Jennifer Barlow: Dark-sky Devotee |url=http://www.skyandtelescope.com/astronomy-resources/jennifer-barlow-dark-sky-devotee/ |website=[[Sky & Telescope]] |date=19 July 2006 |access-date=2015-12-06 |language=en-US}}</ref> It has been endorsed by the [[International Dark-Sky Association]], the [[American Astronomical Society]], the [[Astronomical League]], and ''[[Sky & Telescope]]''.<ref name="S&T">{{cite web |url=http://www.skyandtelescope.com/resources/darksky/3307451.html |title=Jennifer Barlow: Dark-sky Devotee |last=Bobra |first=Monica |work=[[Sky & Telescope]] |publisher=Sky Publishing of New Track Media |access-date=2009-04-14 |archive-url=https://web.archive.org/web/20131227062849/http://www.skyandtelescope.com/resources/darksky/3307451.html |archive-date=2013-12-27 |url-status=dead }}</ref>


==Goal==
==Goal==
The goals of the event are to:
The goals of the event are to:
* Temporarily reduce light pollution and raise awareness about its effects on the night sky,
* Temporarily reduce [[light pollution]] and raise awareness about its effects on the night sky,
* Encourage the use of better lighting systems that direct light downward instead of into the sky, and
* Encourage the use of better lighting systems that direct light downward instead of into the sky, and
* Promote the study of [[astronomy]].
* Promote the study of [[astronomy]].


This event always occurs in April, during the week of the New moon so that the sky can be as dark as possible for optimum viewing conditions.
This event always occurs in April, during the week of the new moon so that the sky can be as dark as possible for optimum viewing conditions.


Jennifer Barlow states, "The night sky is a gift of such tremendous beauty that should not be hidden under a blanket of wasted light. It should be visible so that future generations do not lose touch with the wonder of our [[universe]]." Barlow explains, "It is my wish that people see the night sky in all of its glory, without excess light in the sky as our ancestors saw it hundreds of years ago."<ref name="S&T"/>
Jennifer Barlow states, "The night sky is a gift of such tremendous beauty that should not be hidden under a blanket of wasted light. It should be visible so that future generations do not lose touch with the wonder of our [[universe]]." Barlow explains, "It is my wish that people see the night sky in all of its glory, without excess light in the sky as our ancestors saw it hundreds of years ago."<ref name="S&T"/>
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Willing participants in this project turn off all unnecessary lighting indoors and outdoors sources in order to reduce light pollution of the night sky.
Willing participants in this project turn off all unnecessary lighting indoors and outdoors sources in order to reduce light pollution of the night sky.


⚫
The International Dark-Sky Association encourages light users to take precautions against outdoor light pollution by:<ref>{{Cite web|title = Outdoor Lighting Basics|url = http://darksky.org/lighting/lighting-basics/|website = International Dark-Sky Association|accessdate = 2015-10-22|archive-date = 2015-10-10|archive-url = https://web.archive.org/web/20151010014025/http://darksky.org/lighting/lighting-basics/|url-status = dead}}</ref>
The International Dark-sky Association encourages light
⚫
users to take precautions against outdoor light pollution by:<ref>{{Cite web|title = Outdoor Lighting Basics|url = http://darksky.org/lighting/lighting-basics/|website = International Dark-Sky Association|accessdate = 2015-10-22}}</ref>


* Using outdoor light only when needed
* Using outdoor light only when needed
*Confine light to specific areas
*Confine light to specific areas
*Beware that lights are only as bright as it is necessary
*Be aware that lights need only be as bright as it is necessary
*Reducing the amount of [[Visible spectrum|blue light]] emissions used
*Reducing the amount of [[Visible spectrum|blue light]] emissions used
*Use of lighting that faces downward, in order to avoid over illumination, called [[fully shielded fixtures]]
*Use of lighting that faces downward, in order to avoid over illumination, called [[fully shielded fixtures]]


==Types of Light Pollution==
==Types of light pollution==
[[Light pollution]] is a broad term used to define excess artificial light that brightens the night sky. Types of light pollution which include:
[[Light pollution]] is a broad term used to define excess artificial light that brightens the night sky. Types of light pollution which include:
* [[Skyglow]], a hazy glow produced by the reflection water molecules in the air that encompasses cities which prevent the night sky to be fully seen.<ref>{{Cite web|title = What is sky glow? {{!}} Light Pollution {{!}} Lighting Answers {{!}} NLPIP|url = http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightpollution/skyGlow.asp|website = www.lrc.rpi.edu|accessdate = 2015-11-23}}</ref>
* [[Skyglow]], a hazy glow produced by the reflection water molecules in the air that encompasses cities which prevent the night sky to be fully seen.<ref>{{Cite web|title = What is sky glow? {{!}} Light Pollution {{!}} Lighting Answers {{!}} NLPIP|url = http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightpollution/skyGlow.asp|website = www.lrc.rpi.edu|accessdate = 2015-11-23}}</ref>
* [[Light trespass]] is a condition in which light is oriented into areas in which it is not needed. A common example is street lighting projecting in all directions including the sky which creates a hazy reflection upon the night sky, making it difficult for star observation.<ref name="physics.fau.edu">{{Cite web|title = Light Pollution Impacts Animals and Environment|url = http://physics.fau.edu/observatory/lightpol-environ.html|website = physics.fau.edu|accessdate = 2015-10-22}}</ref>
* [[Light trespass]] is a condition in which light is oriented into areas in which it is not needed. A common example is street lighting projecting in all directions including the sky which creates a hazy reflection upon the night sky, making it difficult for star observation.<ref name="physics.fau.edu">{{Cite web|title = Light Pollution Impacts Animals and Environment|url = http://physics.fau.edu/observatory/lightpol-environ.html|website = physics.fau.edu|accessdate = 2015-10-22|archive-date = 2016-11-21|archive-url = https://web.archive.org/web/20161121001322/http://physics.fau.edu/observatory/lightpol-environ.html|url-status = dead}}</ref>
* [[Over-illumination]] is the excess supply of light used beyond what is necessary for safety and efficiency.
* [[Over-illumination]] is the excess supply of light used beyond what is necessary for safety and efficiency.
* [[Light clutter]] which refers to the common organizational groupings of lights in cities and roadways.
* [[Light clutter]] which refers to the common organizational groupings of lights in cities and roadways.
* [[Glare]] is an impeding bright light which cause temporary impairments to human sight. There are three classifications of glare, blinding glare, disability glare and discomfort glare. (See [[Light pollution]])
* [[Glare (vision)|Glare]] is an impeding bright light which cause temporary impairments to human sight. There are three classifications of glare, blinding glare, disability glare and discomfort glare.


==Implications of Light Pollution==
==Implications of light pollution==
[[Light pollution]] is the adverse effects of artificial light.<ref>{{Cite web|title = Light Pollution Impacts Animals and Environment|url = http://physics.fau.edu/observatory/lightpol-environ.html|website = physics.fau.edu|accessdate = 2015-10-20}}</ref>
[[Light pollution]] is the adverse effects of artificial light.<ref>{{Cite web|title = Light Pollution Impacts Animals and Environment|url = http://physics.fau.edu/observatory/lightpol-environ.html|website = physics.fau.edu|accessdate = 2015-10-20|archive-date = 2016-11-21|archive-url = https://web.archive.org/web/20161121001322/http://physics.fau.edu/observatory/lightpol-environ.html|url-status = dead}}</ref>


Affected parties of light pollution include:<ref name="Chepesiuk A20-A27">{{Cite journal|title = Missing the Dark: Health Effects of Light Pollution|url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2627884/|journal = Environmental Health Perspectives|date = 2009-01-01|issn = 0091-6765|pmc = 2627884|pmid = 19165374|pages = A20-A27|volume = 117|issue = 1|first = Ron|last = Chepesiuk|doi=10.1289/ehp.117-a20}}</ref>
Affected parties of light pollution include:<ref name="Chepesiuk A20-A27">{{Cite journal|title = Missing the Dark: Health Effects of Light Pollution|journal = Environmental Health Perspectives|date = 2009-01-01|issn = 0091-6765|pmc = 2627884|pmid = 19165374|pages = A20–A27|volume = 117|issue = 1|first = Ron|last = Chepesiuk|doi=10.1289/ehp.117-a20}}</ref>


'''Astronomers:'''
'''Astronomers:'''


By increasing the number of participants, the quality of viewing the sky and stars will be temporarily improved. This is a benefit to astronomers that are faced with light pollution issues such as [[light trespass]] and [[skyglow]].<ref name="physics.fau.edu"/>
By increasing the number of participants, the quality of viewing the sky and stars will be temporarily improved. This is of benefit to astronomers who are faced with light pollution issues such as [[light trespass]] and [[skyglow]].<ref name="physics.fau.edu"/>


'''Nocturnal wildlife:'''
⚫
'''Nocturnal Wildlife:'''<br>Several animal species have been documented to be affected by light pollution. The glare of street lights cause distraction to nocturnal birds in flight leading to bird crashes into sky scrapers and buildings. The use of light may also cause birds to reproduce or migrate too early. The feeding behavior of insects, bats, sea turtles, fish, replies reflect alterations by artificial light. Sea turtles mistake the glow of electric lights for the shimmer of the ocean, leading them to flock outside of their nest into hazardous areas.<ref>{{Cite web|title = Light Pollution Effects on Wildlife and Ecosystems|url = http://darksky.org/light-pollution/wildlife/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref>


⚫
Several animal species have been documented to be affected by light pollution. The glare of street lights causes distraction to nocturnal birds in flight, leading to bird crashes into sky scrapers and buildings. The use of light may also cause birds to reproduce or migrate too early. The feeding behavior of insects, bats, sea turtles, fish, and reptiles reflect alterations by artificial light. Sea turtles mistake the glow of electric lights for the shimmer of the ocean, leading them to flock outside of their nest into hazardous areas.<ref>{{Cite web|title = Light Pollution Effects on Wildlife and Ecosystems|url = http://darksky.org/light-pollution/wildlife/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref>
⚫
'''Human Circadian rhythm and sleep patterns:'''


⚫
'''Human circadian rhythm and sleep patterns:'''
Exposure to light during traditional sleeping hours have are
documented to cause disruptions in the circadian rhythm that regulate human
⚫
sleep cycles.<ref name="Chepesiuk A20-A27"/> Biologists have noted a decrease in the amount of [[melatonin]], a natural hormone that regulates the [[Circadian rhythm]], in humans that are exposed to light pollution of the night sky.<ref name="Human Health">{{Cite web|title = Human Health|url = http://darksky.org/light-pollution/human-health/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref> In order to prevent major impact, biologists suggest to increase the amount of natural light exposure during the day and decrease the amount of electrical light consumed at night.<ref name="Human Health"/>


⚫
Exposure to light during traditional sleeping hours are documented to cause disruptions in the circadian rhythm that regulate human sleep cycles.<ref name="Chepesiuk A20-A27"/> Biologists have noted a decrease in the amount of [[melatonin]], a natural hormone that regulates the [[Circadian rhythm]], in humans that are exposed to light pollution of the night sky.<ref name="Human Health">{{Cite web|title = Human Health|url = http://darksky.org/light-pollution/human-health/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref> In order to prevent major impact, biologists suggest increasing the amount of natural light exposure during the day and decreasing the amount of electrical light consumed at night.<ref name="Human Health"/>
⚫
'''Growth Patterns of Plants and Trees:'''


⚫
'''Growth patterns of plants and trees:'''
⚫
The growing pattern of trees have been disrupted and less adjusted to seasonal
changes in weather and light exposure.<ref name="Chepesiuk A20-A27"/>


⚫
The growing pattern of trees have been disrupted and less adjusted to seasonal changes in weather and light exposure.<ref name="Chepesiuk A20-A27"/>
⚫
'''Waste of Economic Resources:'''

⚫
'''Waste of economic resources:'''


Leaving lights on that are not in use can lead to the waste of economic cost expenditures. Conservation and efficiency is necessary for environmental responsibility.<ref name="Chepesiuk A20-A27" /> The invention of LED lights, dimmers, motion sensors and times have reduced the amount of energy used.<ref>{{Cite web|title = Light Pollution Wastes Energy and Money|url = http://darksky.org/light-pollution/energy-waste/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref>
Leaving lights on that are not in use can lead to the waste of economic cost expenditures. Conservation and efficiency is necessary for environmental responsibility.<ref name="Chepesiuk A20-A27" /> The invention of LED lights, dimmers, motion sensors and times have reduced the amount of energy used.<ref>{{Cite web|title = Light Pollution Wastes Energy and Money|url = http://darksky.org/light-pollution/energy-waste/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref>


==Legislation==
==Legislation==
The best way to take action to promote dark skies is to get involved in local government. There are templates for [[light ordinances]] that can legally ban the use of harmful lights and limit commercial lighting to a specific curfew. Currently, there are no nationwide standards regarding light pollution. However, select cities across the [[United States]] and [[Canada]] are taking initiative to facilitate dark sky cities in order to reduce light pollution and view the night sky within city limits.
Currently, there are no nationwide standards regarding light pollution. However, select cities across the [[United States]] and [[Canada]] are taking initiative to facilitate dark sky cities in order to reduce light pollution and view the night sky within city limits.


==Event dates==
==Event dates==
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| '''Year'''
| '''Year'''
| '''Week'''
| '''Week'''
| '''New Moon'''
| '''New moon (UTC)'''
| '''Notes'''
| '''Notes'''
| '''Reference'''
| '''Reference'''
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| style="text-align:center;"| 1
| style="text-align:center;"| 1
| style="text-align:center;"| 2003
| style="text-align:center;"| 2003
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 1 April 2003 UTC
| style="text-align:left;"| 1 April
|
|
|
|
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| style="text-align:center;"| 2
| style="text-align:center;"| 2
| style="text-align:center;"| 2004
| style="text-align:center;"| 2004
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 19 April 2004 UTC
| style="text-align:left;"| 19 April
|
|
|
|
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| style="text-align:center;"| 3
| style="text-align:center;"| 3
| style="text-align:center;"| 2005
| style="text-align:center;"| 2005
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 8 April 2005 UTC
| style="text-align:left;"| 8 April
|
|
|
|
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| style="text-align:center;"| 4
| style="text-align:center;"| 4
| style="text-align:center;"| 2006
| style="text-align:center;"| 2006
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 27 April 2006 UTC
| style="text-align:left;"| 27 April
|
|
|
|
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| style="text-align:center;"| 5
| style="text-align:center;"| 5
| style="text-align:center;"| 2007
| style="text-align:center;"| 2007
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 17 April 2007 UTC
| style="text-align:left;"| 17 April
|
|
|
|
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| style="text-align:center;"| 6
| style="text-align:center;"| 6
| style="text-align:center;"| 2008
| style="text-align:center;"| 2008
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 6 April 2008 UTC
| style="text-align:left;"| 6 April
| In 2008, the organizers coordinated the week with [[Earth Hour]].
| In 2008, the organizers coordinated the week with [[Earth Hour]].
| <ref name=WG/>
| <ref name=WG/>
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| style="text-align:center;"| 7
| style="text-align:center;"| 7
| style="text-align:center;"| 2009
| style="text-align:center;"| 2009
| style="text-align:right;"| April 20–26, 2009
| style="text-align:left;"| April 20–26
| style="text-align:right;"| 25 April 2009 UTC
| style="text-align:left;"| 25 April
| [[International Year of Astronomy|International Year of Astronomy (IYA 2009)]]<br>In 2009, the United States Dark Sky Week becomes [[International Dark Sky Week]]
| [[International Year of Astronomy|International Year of Astronomy (IYA 2009)]]<br>In 2009, the United States Dark Sky Week becomes International Dark Sky Week
| <ref>{{cite web |url=http://www.astronomerswithoutborders.org/tdtes-home/116-gam-global-programs/dark-skies/257-international-dark-sky-week.html |title=International Dark Sky Week |author=<!--Staff writer(s); no by-line.--> |website=Astronomers Without Borders |publisher=AWB |accessdate=20 October 2015}}</ref><ref>{{cite web |url = http://www.astronomerswithoutborders.org/tdtes-home/116-gam-global-programs/dark-skies/257-international-dark-sky-week.html|author = <!--Staff writer(s); no by-line.-->|website = Astronomers Without Borders|publisher = |accessdate = 20 October 2015|title = International Dark Sky Week}}</ref>
| <ref>{{cite web |url=http://www.astronomerswithoutborders.org/tdtes-home/116-gam-global-programs/dark-skies/257-international-dark-sky-week.html |title=International Dark Sky Week |author=<!--Staff writer(s); no by-line.--> |website=Astronomers Without Borders |publisher=AWB |accessdate=20 October 2015}}</ref><ref>{{cite web |url = http://www.astronomerswithoutborders.org/tdtes-home/116-gam-global-programs/dark-skies/257-international-dark-sky-week.html|author = <!--Staff writer(s); no by-line.-->|website = Astronomers Without Borders|publisher = |accessdate = 20 October 2015|title = International Dark Sky Week}}</ref>
|-
|-
| style="text-align:center;"| 8
| style="text-align:center;"| 8
| style="text-align:center;"| 2010
| style="text-align:center;"| 2010
| style="text-align:right;"| April 4–10, 2010
| style="text-align:left;"|
| style="text-align:right;"| 13–14 April 2010 UTC
| style="text-align:left;"| 13–14 April
|
|
| <ref>{{cite web |url=http://www.astronomerswithoutborders.org/tdtes-home/116-gam-global-programs/dark-skies/257-international-dark-sky-week.html |title= International Dark Sky Week |author=<!--Staff writer(s); no by-line.--> |website=Astronomers Without Borders |publisher=AWB |accessdate=25 December 2013}}</ref><ref>{{cite web |url=http://www.darkskiesawareness.org/idsw.php |title=How to participate in International Dark-Sky Week |author=<!--Staff writer(s); no by-line.--> |website=Dark Skies
| <ref>{{cite web |url=http://www.astronomerswithoutborders.org/tdtes-home/116-gam-global-programs/dark-skies/257-international-dark-sky-week.html |title= International Dark Sky Week |author=<!--Staff writer(s); no by-line.--> |website=Astronomers Without Borders |publisher=AWB |accessdate=25 December 2013}}</ref><ref>{{cite web |url=http://www.darkskiesawareness.org/idsw.php |title=How to participate in International Dark-Sky Week |author=<!--Staff writer(s); no by-line.--> |website=Dark Skies Awareness |publisher= |accessdate=25 December 2013 |archive-date=17 January 2020 |archive-url=https://web.archive.org/web/20200117161807/http://www.darkskiesawareness.org/idsw.php |url-status=dead }}</ref>
Awareness |publisher= |accessdate=25 December 2013}}</ref>
|-
|-
| style="text-align:center;"| 9
| style="text-align:center;"| 9
| style="text-align:center;"| 2011
| style="text-align:center;"| 2011
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 3 April 2011 UTC
| style="text-align:left;"| 3 April
| The world's first International Dark Sky City was founded in Flagstaff, AZ <ref>{{Cite web|title = Flagstaff: The World's First Dark Sky City|url = https://darkskydiary.wordpress.com/2011/10/02/flagstaff-the-worlds-first-dark-sky-city/|website = Dark Sky Diary|accessdate = 2015-12-07}}</ref><ref>{{Cite web|title = International Dark Sky Communities|url = http://darksky.org/idsp/communities/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref>
| The world's first International Dark Sky City was founded in Flagstaff, AZ <ref>{{Cite web|title = Flagstaff: The World's First Dark Sky City|url = https://darkskydiary.wordpress.com/2011/10/02/flagstaff-the-worlds-first-dark-sky-city/|website = Dark Sky Diary|date = 2 October 2011|accessdate = 2015-12-07}}</ref><ref>{{Cite web|title = International Dark Sky Communities|url = http://darksky.org/idsp/communities/|website = International Dark-Sky Association|accessdate = 2015-12-07|language = en-US}}</ref>
|
|
|-
|-
| style="text-align:center;"| 10
| style="text-align:center;"| 10
| style="text-align:center;"| 2012
| style="text-align:center;"| 2012
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 21 April 2012 UTC
| style="text-align:left;"| 21 April
|
|
|
|
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| style="text-align:center;"| 11
| style="text-align:center;"| 11
| style="text-align:center;"| 2013
| style="text-align:center;"| 2013
| style="text-align:right;"|
| style="text-align:left;"|
| style="text-align:right;"| 10 April 2013 UTC
| style="text-align:left;"| 10 April
|
|
|
|
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| style="text-align:center;"| 12
| style="text-align:center;"| 12
| style="text-align:center;"| 2014
| style="text-align:center;"| 2014
| style="text-align:right;"| April 20–26, 2014
| style="text-align:left;"| April 20–26
| style="text-align:right;"| 29 April 2014 UTC
| style="text-align:left;"| 29 April
|
|
| <ref name="DSW2014">{{cite web |url=http://www.darksky.org/resources/109-international-dark-sky-week |title=International Dark Sky Week April 20-26, 2014 |website=Dark Sky |publisher=IDA |accessdate=25 December 2013}}</ref>
| <ref name="DSW2014">{{cite web |url=http://www.darksky.org/resources/109-international-dark-sky-week |title=International Dark Sky Week April 20-26, 2014 |website=Dark Sky |publisher=IDA |accessdate=25 December 2013}}</ref>
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| style="text-align:center;"| 13
| style="text-align:center;"| 13
| style="text-align:center;"| 2015
| style="text-align:center;"| 2015
| style="text-align:right;"| April 13–18, 2015
| style="text-align:left;"| April 13–18
| style="text-align:right;"| 18 April 2015 UTC
| style="text-align:left;"| 18 April
| [[International Year of Light|International Year of Light and Light-based Technologies (IYL 2015)]]
| [[International Year of Light|International Year of Light and Light-based Technologies (IYL 2015)]]
|
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|-
|14
|2016
| April 4-10
|7 April
|
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|-
|15
|2017
| April 22-28
|26 April
|The first day (April 22) corresponded with [[Earth Day]].
|
|-
|16
|2018
|
|16 April
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|-
|17
|2019
|March 31- April 7
|5 April
|
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|-
|18
|2020
|April 19-26
|22 April
|
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|-
|19
|2021
|April 5-12
|12 April
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|-
|20
|2022
|April 22-30
|1 April, 30 April
|
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|-
|21
|2023
|April 17-23
|20 April
|
|
|- style="background: #a5a5d9"
|22
|2024
|April 2-8
|8 April
|A total [[solar eclipse]] took place on [[Solar eclipse of April 8, 2024|8 April.]]
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|}
|}
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==See also==
==See also==
Line 204: Line 267:
* [[Dark-sky movement]]
* [[Dark-sky movement]]
* [[Earth Hour]]
* [[Earth Hour]]
* [[National Astronomy Week|National Astronomy Week (NAW)]]
* [[National Astronomy Week]]
*[[White House Astronomy Night]]
* [[Noctcaelador]]
* [[White House Astronomy Night]]
⚫
* [[Light pollution]]
* [[Bortle scale]]


==References==
==References==
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*{{cite web|url=http://www.astronomy.com/asy/default.aspx?c=a&id=5440|title=National Dark-Sky Week|date=April 16, 2007|work=[[Astronomy Magazine]]|publisher=[[Kalmbach Publishing]] Co}}
*{{cite web|url=http://www.astronomy.com/asy/default.aspx?c=a&id=5440|title=National Dark-Sky Week|date=April 16, 2007|work=[[Astronomy Magazine]]|publisher=[[Kalmbach Publishing]] Co}}


⚫
[[Category:Light pollution|>]]
{{DEFAULTSORT:Dark-Sky Week, National}}
⚫
[[Category:Environmental awareness days]]
[[Category:Awareness weeks]]
[[Category:2003 establishments in the United States]]
[[Category:2003 establishments in the United States]]
[[Category:April observances]]
[[Category:April observances]]
⚫
[[Category:Environmental awareness days]]
⚫
[[Category:Light pollution]]
[[Category:Recurring events established in 2003]]
[[Category:Recurring events established in 2003]]
⚫
[[Category:Thematic weeks]]
[[Category:Unofficial observances]]
[[Category:Unofficial observances]]
[[Category:Astronomy education events]]

Latest revision as of 14:17, 9 September 2024

International Dark Sky Week
StatusActive
GenreAstronomy-related events and competitions
FrequencyWeek of the new moon in April
Location(s)Worldwide
Inaugurated2003
FounderJennifer Barlow
Next eventApril 2025
Websitehttps://www.darksky.org
Composite image of worldwide light pollution at night

International Dark Sky Week (formerly the National Dark Sky Week) is held during the week of the new moon in April,[1][2] when people worldwide may turn off their lights to observe the beauty of the night sky without light pollution. This event was founded in 2003 by high school student Jennifer Barlow of Midlothian, Virginia.[3] It has been endorsed by the International Dark-Sky Association, the American Astronomical Society, the Astronomical League, and Sky & Telescope.[4]

Goal

[edit]

The goals of the event are to:

  • Temporarily reduce light pollution and raise awareness about its effects on the night sky,
  • Encourage the use of better lighting systems that direct light downward instead of into the sky, and
  • Promote the study of astronomy.

This event always occurs in April, during the week of the new moon so that the sky can be as dark as possible for optimum viewing conditions.

Jennifer Barlow states, "The night sky is a gift of such tremendous beauty that should not be hidden under a blanket of wasted light. It should be visible so that future generations do not lose touch with the wonder of our universe." Barlow explains, "It is my wish that people see the night sky in all of its glory, without excess light in the sky as our ancestors saw it hundreds of years ago."[4]

Participation

[edit]

Willing participants in this project turn off all unnecessary lighting indoors and outdoors sources in order to reduce light pollution of the night sky.

The International Dark-Sky Association encourages light users to take precautions against outdoor light pollution by:[5]

  • Using outdoor light only when needed
  • Confine light to specific areas
  • Be aware that lights need only be as bright as it is necessary
  • Reducing the amount of blue light emissions used
  • Use of lighting that faces downward, in order to avoid over illumination, called fully shielded fixtures

Types of light pollution

[edit]

Light pollution is a broad term used to define excess artificial light that brightens the night sky. Types of light pollution which include:

  • Skyglow, a hazy glow produced by the reflection water molecules in the air that encompasses cities which prevent the night sky to be fully seen.[6]
  • Light trespass is a condition in which light is oriented into areas in which it is not needed. A common example is street lighting projecting in all directions including the sky which creates a hazy reflection upon the night sky, making it difficult for star observation.[7]
  • Over-illumination is the excess supply of light used beyond what is necessary for safety and efficiency.
  • Light clutter which refers to the common organizational groupings of lights in cities and roadways.
  • Glare is an impeding bright light which cause temporary impairments to human sight. There are three classifications of glare, blinding glare, disability glare and discomfort glare.

Implications of light pollution

[edit]

Light pollution is the adverse effects of artificial light.[8]

Affected parties of light pollution include:[9]

Astronomers:

By increasing the number of participants, the quality of viewing the sky and stars will be temporarily improved. This is of benefit to astronomers who are faced with light pollution issues such as light trespass and skyglow.[7]

Nocturnal wildlife:

Several animal species have been documented to be affected by light pollution. The glare of street lights causes distraction to nocturnal birds in flight, leading to bird crashes into sky scrapers and buildings. The use of light may also cause birds to reproduce or migrate too early. The feeding behavior of insects, bats, sea turtles, fish, and reptiles reflect alterations by artificial light. Sea turtles mistake the glow of electric lights for the shimmer of the ocean, leading them to flock outside of their nest into hazardous areas.[10]

Human circadian rhythm and sleep patterns:

Exposure to light during traditional sleeping hours are documented to cause disruptions in the circadian rhythm that regulate human sleep cycles.[9] Biologists have noted a decrease in the amount of melatonin, a natural hormone that regulates the Circadian rhythm, in humans that are exposed to light pollution of the night sky.[11] In order to prevent major impact, biologists suggest increasing the amount of natural light exposure during the day and decreasing the amount of electrical light consumed at night.[11]

Growth patterns of plants and trees:

The growing pattern of trees have been disrupted and less adjusted to seasonal changes in weather and light exposure.[9]

Waste of economic resources:

Leaving lights on that are not in use can lead to the waste of economic cost expenditures. Conservation and efficiency is necessary for environmental responsibility.[9] The invention of LED lights, dimmers, motion sensors and times have reduced the amount of energy used.[12]

Legislation

[edit]

Currently, there are no nationwide standards regarding light pollution. However, select cities across the United States and Canada are taking initiative to facilitate dark sky cities in order to reduce light pollution and view the night sky within city limits.

Event dates

[edit]
Timeline of Dark Sky Week events
Sr. Year Week New moon (UTC) Notes Reference
1 2003 1 April
2 2004 19 April
3 2005 8 April
4 2006 27 April
5 2007 17 April
6 2008 6 April In 2008, the organizers coordinated the week with Earth Hour. [2]
7 2009 April 20–26 25 April International Year of Astronomy (IYA 2009)
In 2009, the United States Dark Sky Week becomes International Dark Sky Week 		[13][14]
8 2010 13–14 April [15][16]
9 2011 3 April The world's first International Dark Sky City was founded in Flagstaff, AZ [17][18]
10 2012 21 April
11 2013 10 April
12 2014 April 20–26 29 April [19]
13 2015 April 13–18 18 April International Year of Light and Light-based Technologies (IYL 2015)
14 2016 April 4-10 7 April
15 2017 April 22-28 26 April The first day (April 22) corresponded with Earth Day.
16 2018 16 April
17 2019 March 31- April 7 5 April
18 2020 April 19-26 22 April
19 2021 April 5-12 12 April
20 2022 April 22-30 1 April, 30 April
21 2023 April 17-23 20 April
22 2024 April 2-8 8 April A total solar eclipse took place on 8 April.
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See also

[edit]

References

[edit]
  1. ^ "Home".
  2. ^ a b "What Is National Dark Sky Week?". Wise Geek. Conjecture Corporation. Retrieved 25 December 2013.
  3. ^ "Jennifer Barlow: Dark-sky Devotee". Sky & Telescope. 19 July 2006. Retrieved 2015-12-06.
  4. ^ a b Bobra, Monica. "Jennifer Barlow: Dark-sky Devotee". Sky & Telescope. Sky Publishing of New Track Media. Archived from the original on 2013-12-27. Retrieved 2009-04-14.
  5. ^ "Outdoor Lighting Basics". International Dark-Sky Association. Archived from the original on 2015-10-10. Retrieved 2015-10-22.
  6. ^ "What is sky glow? | Light Pollution | Lighting Answers | NLPIP". www.lrc.rpi.edu. Retrieved 2015-11-23.
  7. ^ a b "Light Pollution Impacts Animals and Environment". physics.fau.edu. Archived from the original on 2016-11-21. Retrieved 2015-10-22.
  8. ^ "Light Pollution Impacts Animals and Environment". physics.fau.edu. Archived from the original on 2016-11-21. Retrieved 2015-10-20.
  9. ^ a b c d Chepesiuk, Ron (2009-01-01). "Missing the Dark: Health Effects of Light Pollution". Environmental Health Perspectives. 117 (1): A20 – A27. doi:10.1289/ehp.117-a20. ISSN 0091-6765. PMC 2627884. PMID 19165374.
  10. ^ "Light Pollution Effects on Wildlife and Ecosystems". International Dark-Sky Association. Retrieved 2015-12-07.
  11. ^ a b "Human Health". International Dark-Sky Association. Retrieved 2015-12-07.
  12. ^ "Light Pollution Wastes Energy and Money". International Dark-Sky Association. Retrieved 2015-12-07.
  13. ^ "International Dark Sky Week". Astronomers Without Borders. AWB. Retrieved 20 October 2015.
  14. ^ "International Dark Sky Week". Astronomers Without Borders. Retrieved 20 October 2015.
  15. ^ "International Dark Sky Week". Astronomers Without Borders. AWB. Retrieved 25 December 2013.
  16. ^ "How to participate in International Dark-Sky Week". Dark Skies Awareness. Archived from the original on 17 January 2020. Retrieved 25 December 2013.
  17. ^ "Flagstaff: The World's First Dark Sky City". Dark Sky Diary. 2 October 2011. Retrieved 2015-12-07.
  18. ^ "International Dark Sky Communities". International Dark-Sky Association. Retrieved 2015-12-07.
  19. ^ "International Dark Sky Week April 20-26, 2014". Dark Sky. IDA. Retrieved 25 December 2013.
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