AST 101 Lecture Notes - Lecture 11: Seismic Wave, Celestial Mechanics, Orbital Period
13 Oct 2016
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Exam scores still in the process of fixing. Most errors from typos some yours, some mine. Writing assignment due october 10 (next monday) due by noon ta"s mailboxes are in front of room 201 (main office) Warmup question for next tuesday will be sent out tomorrow. Quotes of the day summary: newton believed everything was simple. Planets travel in elliptical orbits, with the sun at one focus. The line going from the su to the planet sweeps out equal areas in equal times. The time that a planet takes to go around the sun increases as the 3/2 power of the long axis of the ellipse. Each colored wedge has the same area, and the planet takes the same time to go through each. Kepler"s third law of orbital motion says that the square of a planet"s orbital period is proportional to the cube of its semi-major axis.
