AST 2002 Lecture Notes - Lecture 3: Winter Triangle, The Moons, Ecliptic
Document Summary
The night sky: what we see when we look up, patterns in the sky, motions in the sky b. i. The rotation of the earth about its axis: the reasons for the seasons year c. i. Different constellations across the sky over the course of the year: the moon, our constant companion month d. i. The moon"s orbit around the earth: the ancient mystery of the planets e. i. Some southern hemisphere constellations were named by european explorers: the patterns of stars have no physical significant. Greenwich, england: the celestial sphere, the sky above looks like a dome a hemisphere b, this is a 2-dimensional representation of the sky. If we imagine the sky around the entire earth, we have the celestial sphere c. i. If you are standing at the poles, nothing rises or sets. Lecture notes 08/29/2016: the day, sidereal day a. i. How long it takes to rotte once. a. ii.
