87 (number): Difference between revisions
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* The year AD '''[[87]]''', [[87 BC]], or [[1987]]. |
* The year AD '''[[87]]''', [[87 BC]], or [[1987]]. |
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[[es:Ochenta y siete]] |
[[es:Ochenta y siete]] |
Revision as of 03:48, 6 February 2005
87 is the natural number following 86 and preceding 88.
Template:Numbers 80s | |
Cardinal | eighty-seven |
Ordinal | 87th (eighty-seventh) |
Factorization | |
Roman numeral | LXXXVII |
Binary | 01010111 |
Hexadecimal | 57 |
In mathematics
Eighty-seven is the sum of the squares of the first four primes.
In science
- The atomic number of francium
In astronomy,
- Messier object M87, a magnitude 11.0 elliptical galaxy in the constellation Virgo, also known as the Virgo A Galaxy
- The New General Catalogue object NGC 87, a galaxy in the constellation Phoenix, a member of Robert's Quartet
- The Saros number of the solar eclipse series which began on -76 February 3 and ended on 1222 April 13. The duration of Saros series 87 was 1298.1 years, and it contained 73 solar eclipses.
- The Saros number of the lunar eclipse series which began on 9 July 25 and ended on 1325 September 23. The duration of Saros series 87 was 1316.2 years, and it contained 74 lunar eclipses.
In other fields
Eighty-seven is also:
- the number of years between the signing of the U.S. Declaration of Independence and the Battle of Gettysburg, immortalized in Abraham Lincoln's Gettysburg Address: Fourscore and seven years ago, our forefathers...
- the model number of Junkers Ju 87
- the number of the French department Haute-Vienne
- the designation of Interstate 87, a freeway in New York; the European route E87 from Tulcea to Antalya
- the code for international direct dial phone calls to Inmarsat and other services
- the 87 photographic filter blocks visible light allowing only infrared light to pass
- considered an unlucky number of runs by some players in the sport of cricket, because it is 13 less than 100.
- a slang term for anilingus
- The ISBN Group Identifier for books published in Denmark.
- The year AD 87, 87 BC, or 1987.