Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
3,914,100,783 visitors served.
forum Join the Word of the Day Mailing List For webmasters
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

Peter Andreas Hansen
(redirected from P. A. Hansen)

   Also found in: Wikipedia 0.01 sec.
Hansen, Peter Andreas 

Born Dec. 8, 1795, in Tondern, Schleswig; died Mar. 28, 1874, in Gotha. German astronomer and geodesist of Danish descent.

Hansen was director of the Seeberg Observatory in Gotha from 1825 to 1874. He refined the theory of the motion of the moon (1838, 1862-64); compiled tables of its motion (1857, accuracy of l″-2″ for the period 1750-1850), which were replaced only in the 1920’s; and refined the value of the solar parallax (8.92″). He also worked on the theory of the perturbed motions of planets, asteroids, and comets and on solar eclipses (new sun tables, 1854).

REFERENCES

Berry, A. Kratkaia istoriia astronomii. Moscow-Leningrad, 1946. Pages 312-15. (Translated from English; with bibliography.)
Pannekoek, A. Istoriia astronomii. Moscow, 1966. (Translated from English.)
Seleshnikov, S. I. Astronomiia i kosmonavtika. Kiev, 1967.

A. I. EREMEEVA



Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link
Feedback
Mentioned in?   Encyclopedia browser?   Full browser?
No references found
 
 
 
Encyclopedia
?

Terms of Use | Privacy policy | Feedback | Advertise with Us | Copyright © 2012 Farlex, Inc.
Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.