PHYS 190 Lecture Notes - Lecture 5: Heliocentrism, Deferent And Epicycle, Solar Eclipse
24 Jan 2018
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Unlike solar eclipse, everyone who can see moon during lunar eclipse sees eclipse. Also, total lunar eclipse lasts much longer, about 100 mins max. Lunar eclipses only happen at full moon. Red light can get through atmosphere more easily than blue light. Lunar eclipses generally not so red, and partial lunar eclipses are common. Diff. b/w supermoon & normal full moon difficult to distinguish. Answer: the plane of the moon"s orbit is tilted. Most of the time, moon is either below/above sun. Moon"s orbit - tilted & not exactly circular. Hint: earth about 4 times larger than moon. Slight red tint on earth - moon shine(?) Actual images of wandering motion of jupiter and saturn. Notice they are brightest around switch to retrograde. June 2000 to may 2001: 23 images at two-week intervals. From earth: sun, moon, stars, etc appear to go around earth once/day. Circle is perfect form and motion is uniform.
