EASC 108 Study Guide - Midterm Guide: Semi-Major And Semi-Minor Axes, Lunar Phase, Copernican Revolution
18 Dec 2015
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1 au = approx 150 x 106 km speed of light = 300,000km/s or 1080 x 106 km/h. Evening/morning star: cave paintings in france from 18,000 bc suggest lunar phases, bone inscriptions in china from 1400 bc are earliest record of supernova explosions. 7 visible heavenly bodies associate with deities and days of the week. Objects move in perfect spheres ( mars , jupiter and saturn showed. Ptolemaic model is the most sophisticated was sufficiently accurate for 1500 years. Copernican revolution proposed a sun-centred model (1543); isn"t more accurate. Major axis = front , semimajor axis = back , minor axis = smaller major axis of orbit p2=d3. Galileo"s observations: radius focus: laws of orbits: each planet moves in an elliptical orbit with the sun at one. Genius who founded multiple areas of classical physics: optics, gravitation, mechanics. His 3 laws of motions form basis of mechanics.
