NATS 1745 Study Guide - Midterm Guide: Circular Motion, Retrograde And Prograde Motion, Geocentric Model
22 Jul 2017
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Document Summary
Predictions of sun/moon/planets were becoming slowly more inaccurate. Timing of church year (easter) was becoming more off. Though god would not have made such an ugly universe. Movement of the firmament (distant stars and planets) arise due to the motions of the earth. Earth rotates on its own axis, and revolves around the sun. Universe has enormous dimensions (stars are very far away) Able to explain retrograde motion as a perspective effect. Retrograde motion is the apparent backwards motion of planets from the perspective of earth. Copernicus"s heliocentric universe explained it as a perspective effect. Planets that are closer to the sun orbit faster than ones further away. Reason planets appear to move at all is because they are so close to us. 1543 ce copernicus published on the revolutions of the heavenly spheres (heliocentric model), and dies late 1500"s observations. Brahe builds large observatories (no telescope yet) and makes accurate positional.
