AS101 : AS 101 Module 1.docx
Document Summary
1. 3 seeing stars: patterns in the night sky. 3000 individual stars visible to the naked eye. Seeing starts that lie at different distances from earth. Distance from earth is about 30 times the earth"s diameter. 10 stars in a 10ly radius: precession. 23. 5* tilt: the night sky and its motions. Objects in the sky appear to rotate e-w but the earth is actually rotating w-e. What you see in the sky depends on which part of earth you are in. Point directly below you on the other side of the celestial sphere. Extension of the equator onto celestial sphere. Line going from due north through zenith to due south. Same as above but south: angular measurements. Refer to the size of objects by the angle they subtend in degrees(*) Angular distance is the angle made by two lines emanating from observer"s eye or vantage point to the two outer edges of the object.
