AST-0009 Lecture Notes - Lecture 1: Binary Star, Hyperfine Structure, Celestial Equator
Document Summary
Geocentric model of the universe everything is revolving around us. 1524 cosmographia has the earth at the center; earth is circular. Yes, it is visible on the western horizon. We have never found an infinity it is possible that is does exist. Astronomy and art go hand-in-hand: example: celestial sphere in philadelphia. The axial tilt of the earth was first measured over 3,000 years ago: 23. 5 tilt. The celestial equator is the motion of the sun around the earth. Astronomical scale: visualizing very large numbers or very small numbers is very difficult. In the every-day world, we use ourselves as a scale to know what is small and what is large. Our fundamental scales: length: 1 meter = the distance light in a vacuum travels in. Don"t worry, you don"t have to know this for this class! Being able to convert from one scale to another is important.
