ASTR 101 Lecture Notes - Lecture 4: Ecliptic, Lunar Eclipse, Angular Diameter
12 Dec 2017
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Document Summary
Every culture has their own understanding of the night sky. The made constellations to understand it better. With the naked eye, we can see more than 2000 stars as well as the milky way. We are looking at the disk from within. A constellation is a region of the sky. We thought we were the centre on the universe. Still use that theory when we draw the celestial sphere. Stars at different distances all appear to lie on the celestial sphere. The ecliptic is the sun"s apparent path through the celestial sphere. There are two planes: ecliptic plane, equator plane. Ecliptic plane is the celestial imaginary line. A band of light that makes a circle around the celestial sphere. Our view into the plane of our galaxy. Horizon: all points 90 away from zenith. Meridian: line passing through zenith and connecting n and s points on the horizon.
