NATS 1745 Study Guide - Quiz Guide: Retrograde And Prograde Motion, Infinite Mass, Geocentric Model
12 Feb 2016
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Cosmic evolution from moment of creation of universe. Historical discussions across cultures/faiths: has the universe always existed, or did it have a beginning: what is the earth made of, silicon 2. Lots of water: what is the sun made of, hydrogen 2. Understanding and being able to predict rhythms of nature. We are at the centre of the universe: earth is fixed and heavens rotate around us. Trace a path through the background fixed stars" positions change slightly night by night. Occasionally move backwards (retrograde) for periods of time (days/ weeks: aristotle"s universe, earth at centre, moon, sun, planets orbited around earth in perfect circles. Ideological separation between perfection of heavens ( quintessence") and imperfection of man/ Observe and measure nature (positions of planets) Compare to theoretical model for nature/ universe (model is not nature, but rather is an approximation for nature; model can make predictions about nature like where the planets will appear at a future date)
