PHYS 1600 Chapter Notes - Chapter 2: Retrograde And Prograde Motion, Milky Way, Astronomical Unit

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Cosmology: the study of the formation, organization and evolution of the earth. 2-2 the belief that in a sun-centered cosmology formed slowly: Direct motion: the gradual, eastward apparent motion of a planet against the background stars as seen from earth. Retrograde motion: the occasional backward (that is westward) apparent motion of a planet against the background stars as seen from earth. All planetary motions on the celestial sphere are much slower than the apparent daily (cid:373)o(cid:448)e(cid:373)e(cid:374)t of the e(cid:374)tire sk(cid:455) (cid:272)aused (cid:271)(cid:455) earth"s rotatio(cid:374) Ancient greek astronomer aristarchus of samsos proposed a more straightforward explanation of planetary motion, that the planets revolve around the sun. The retrograde motion of mars in a heliocentric cosmology occurs because faster moving earth over-takes and passes mars. Heliocentric is a misleading word: the sun and the bodies that orbit it all orbit the center of our. Gravitational force of the planets is held by the sun.

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