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Encyclopedia > Jean Richer

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Jean Richer (born 1630; died 1696 in Paris) was a French astronomer and assistant (élève astronome) of Giovanni Domenico Cassini. Events February 22 - Native American Quadequine introduces Popcorn to English colonists. ... The year 1696 had the earliest equinoxes and solstices for 400 years in the Gregorian calendar, because this year is a leap year and the Gregorian calendar would have behaved like the Julian calendar since March 1500 had it have been in use that long. ... City flag City coat of arms Motto: Fluctuat nec mergitur (Latin: Tossed by the waves, she does not sink) The Eiffel Tower in Paris, as seen from the esplanade du Trocadéro. ... An astronomer or astrophysicist is a person whose area of interest is astronomy or astrophysics. ... Giovanni Domenico (Jean-Dominique) Cassini Portrait Giovanni Domenico Cassini (June 8, 1625–September 14, 1712) was an Italian astronomer, engineer, and astrologer. ... Between 1671 and 1673 he traveled to Cayenne to observe Mars during its perigee. This led to an estimate of the distance between sun and Mars. Cayenne is the capital of the French overseas région of French Guiana. ... Mars is the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. ... Perigee is the point at which an object in orbit around the Earth makes its closest approach to the Earth. ... [edit] External links http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Richer.html http://galileo.rice.edu/Catalog/NewFiles/richer.html Persondata NAME Richer, Jean ALTERNATIVE NAMES SHORT DESCRIPTION French astronomer DATE OF BIRTH 1630 PLACE OF BIRTH DATE OF DEATH 1696 PLACE OF DEATH Paris Categories: Astronomer stubs | French people stubs | 1630 births | 1696 deaths

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	The Galileo Project (682 words) Richer's astronomical observations of a lunar eclipse and the satellites of Jupiter led to the determination of the longitude of Cayenne which was three minutes too big. In geodesy Richer's observation of the length of the seconds pendulum improved the understanding of the shape of the earth as a spheroid flattened at the poles. Richer was admitted to the Académie in 1666 as an élève astronome.
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