ASTR 111 Chapter Notes - Chapter 2: Orbital Period, Ecliptic, Heliocentrism
8 Sep 2017
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Phase - state determined by portion of visible face of the moon that is illuminated by sunlight. Phases of the moon - new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third-quarter, waning crescent, new. Synchronous rotation - rotation of an object that always shows same face to an object that it is orbiting because its rotation period and orbital period are equal. Nodes - two points in moon"s orbit where it crosses the ecliptic plane. Penumbra - lighter, outlying regions of a shadow. Total lunar eclipse - moon covered by earth"s umbral shadow. Annular eclipse - solar eclipse during which the moon is directly in front of the sun, but angular size is not big enough to block the sun. Saros cycle - basic patterns of eclipses repeats, which is about 18 years and 11 days. Planet comes from greek term for wandering star .
