Commentariolus

The "Commentariolus" ("Little Commentary") is Nicolaus Copernicus's 40-page outline of an early version of his revolutionary heliocentric theory of the universe.^[1] After further long development of his theory, Copernicus published the mature version in 1543 in his landmark work, De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres).

Copernicus wrote the "Commentariolus" some time before 1514 and circulated copies to his friends and colleagues.^[2] It thus became known among Copernicus's contemporaries, though it was never printed during his lifetime. In 1533, Johann Albrecht Widmannstetter delivered a series of lectures in Rome outlining Copernicus' theory. Pope Clement VII and several Catholic cardinals heard the lectures and were interested in the theory. On 1 November 1536, Nikolaus von Schönberg, Archbishop of Capua and since the preceding year a cardinal, wrote to Copernicus from Rome and asked him for a copy of his writings "at the earliest possible moment".^[3]

Although copies of the "Commentariolus" circulated for a time after Copernicus's death,^[4] it subsequently lapsed into obscurity, and its previous existence remained known only indirectly, until a surviving manuscript copy was discovered and published in the second half of the nineteenth century.^[5]

Summary

Copernicus offered seven postulates:^[6]

Celestial bodies do not all revolve around a single point
The centre of Earth is the centre of the lunar sphere—the orbit of the moon around Earth
All the spheres rotate around the Sun, which is near the centre of the Universe
The distance between Earth and the Sun is an insignificant fraction of the distance from Earth and Sun to the stars, so parallax is not observed in the stars
The stars are immovable; their apparent daily motion is caused by the daily rotation of Earth
Earth is moved in a sphere around the Sun, causing the apparent annual migration of the Sun; Earth has more than one motion
Earth’s orbital motion around the Sun causes the seeming reverse in direction of the motions of the planets.

Notes

^ Koyré (1973, pp.18–28); Rosen (2004, pp.6–7, 57–90). Thoren (1990, p.99) gives the length of the manuscript as 40 pages.
^ A reference to the "Commentariolus" is contained in a library catalogue, dated May 1st, 1514, of a 16th-century historian, Matthew of Miechow, so it must have begun circulating before that date (Koyré, 1973, p.85; Gingerich, 2004, p.32).
^ Schönberg, Nicholas, Letter to Nicolaus Copernicus, translated by Edward Rosen.
^ Tycho Brahe obtained a copy in 1575, and subsequently presented copies to students and colleagues as tokens of his esteem (Dreyer, 1890, p.83; Thoren, 1990, pp.98–99)
^ According to Rosen (2004, pp. 6–7), a manuscript copy of the "Commentariolus" was discovered in Vienna and published in 1878. According to Koyré (1973, p. 76), a very poor copy was published in the 1854 Warsaw edition of De revolutionibus.
^ Goddu, André (2010). Copernicus and the Aristotelian tradition. Leiden, Netherlands: Brill. pp. 245–6. ISBN 978-90-04-18107-6.

Bibliography

Dreyer, John Louis Emil (1890). Tycho Brahe; a picture of scientific life and work in the sixteenth century. Edinburgh: Adam and Charles Black.
Gingerich, Owen (2004). The Book Nobody Read. London: William Heinemann. ISBN 0-434-01315-3.
Koyré, Alexandre (1973). The Astronomical Revolution: Copernicus – Kepler – Borelli. Ithaca, NY: Cornell University Press. ISBN 0-8014-0504-1.
Rosen, Edward (translator) (2004) [1939]. Three Copernican Treatises: The Commentariolus of Copernicus; The Letter against Werner; The Narratio Prima of Rheticus (Second Edition, Revised ed.). New York, NY: Dover Publications, Inc. {{cite book}}: |author= has generic name (help)
Thoren, Victor E. (1990). The Lord of Uraniborg. Cambridge: Cambridge University Press. ISBN 0-521-35158-8.

External links

http://www.fh-augsburg.de/%7Eharsch/Chronologia/Lspost16/Copernicus/kop_c00.html Complete Latin text online at Bibliotheca Augustana.
Edward Rosen's English translation (2004, pp.57–65))
http://www.webcitation.org/query?url=http://www.geocities.com/soho/gallery/8084/copernicus.htm&date=2009-10-26+02:55:34

[1] Koyré (1973, pp.18–28); Rosen (2004, pp.6–7, 57–90). Thoren (1990, p.99) gives the length of the manuscript as 40 pages.

[2] A reference to the "Commentariolus" is contained in a library catalogue, dated May 1st, 1514, of a 16th-century historian, Matthew of Miechow, so it must have begun circulating before that date (Koyré, 1973, p.85; Gingerich, 2004, p.32).

[3] Schönberg, Nicholas, Letter to Nicolaus Copernicus, translated by Edward Rosen.

[4] Tycho Brahe obtained a copy in 1575, and subsequently presented copies to students and colleagues as tokens of his esteem (Dreyer, 1890, p.83; Thoren, 1990, pp.98–99)

[first_published-5] According to Rosen (2004, pp. 6–7), a manuscript copy of the "Commentariolus" was discovered in Vienna and published in 1878. According to Koyré (1973, p. 76), a very poor copy was published in the 1854 Warsaw edition of De revolutionibus.

[6] Goddu, André (2010). Copernicus and the Aristotelian tradition. Leiden, Netherlands: Brill. pp. 245–6. ISBN 978-90-04-18107-6.

[1]

[2]

[3]

[4]

[5]

[6]

v t e Nicolaus Copernicus
Scientific career	Copernican heliocentrism Copernican Revolution
Works	Commentariolus De revolutionibus orbium coelestium Locationes mansorum desertorum "Monetae cudendae ratio" Translations of Theophylact Simocatta
Family	Lucas Watzenrode the Elder (grandfather) Lucas Watzenrode (uncle)
Related	Scientific Revolution Nicolaus Copernicus Gesamtausgabe Copernicus law Copernican principle Frombork Cathedral Astronomer Copernicus, or Conversations with God Monuments Chicago Los Angeles Montreal Toruń Kraków Warsaw Copernicium Copernicus (lunar crater) Copernicus (Martian crater)