AST 101 Study Guide - Ptolemy, Weather Satellite, Net Force
Document Summary
Everything should be in here from the slides to the textbook to the practice exam. Don"t be intimidated by the 23 pages most of it is taken up by pictures of questions from slides which i explained the answers too because he doesn"t post those answers online. There are five planets visible from earth with the naked eye: mercury, venus, mars, Planets orbit the sun in the ecliptic plane. Mercury and venus are always seen near the sun. Mars, jupiter, saturn can be seen near to or away from the sun. If you observe jupiter at the same time (midnight) for a few months, because jupiter orbits the sun its position relative to the background stars will change. It appears to drift west to east through the constellations (prograde) Sometimes it moves the other way (east to west) (retrograde) Ancient astronomers could explain the motion of the stars, sun, and moon.
