ASTR 1001 Lecture 2: Wednesday, January 24
29 Jan 2018
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Document Summary
In general, all things move counterclockwise relative to the northern hemisphere. Earth precessing one time on its axial tilt every 26,000 years. 13,000 years for half a preccesion -> point opposite way of polaris. Orthogonal: the position of the sun, the earth, and the moon are shaped into an l, don"t form an eclipse. You will only get an eclipse when the moon is on the node When the lunar plane crosses the earth"s plane (the sticks the moon is on) Only get an eclipse when you have a new moon or full moon. During a total lunar eclipse, the moon is shining from all the sunrises and sunsets occurring on earth. Rotates on time per revolution -> synchronous revolution + rotation. If we weren"t tilted, we wouldn"t have seasons. If we tilted 45 degrees, each season would be more extreme (summer is hotter, winter is colder)
