ASTR 170B2 Lecture Notes - Lecture 5: Lunar Phase, Ancient Greek, Geocentric Model
6 Sep 2018
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Astr ptys 170b2 - lecture 5 - historical models of the solar system. 1 week after the full moon phase, it will be at the third quarter moon phase. During a total lunar eclipse, the moon is in the full moon phase. We do not have solar eclipses every new moon because the orbit of the moon is inclined about 5 degrees around the earth"s ecliptic and, the moon"s orbit is also elliptical. The planets mercury, venus, jupiter and saturn can be seen with the naked eye and they are bright. The planets also align with the ecliptic (the earth"s orbit. Planets wander with respect to the fixed background stars. The cause of retrograde motion: it occurs because more distant planets orbit more slowly around the sun than the earth. Planets appear in different locations during the year as they and the earth orbit around the sun. World is flat, and all bodies move around you.
