AST210H1 Chapter 1-3: Chapters 1-3 of readings
15 Dec 2011
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Section 4 the moon s phases rotation the spinning of an object about an axis. Geocentric model a model of the universe with the earth t its center. Phases (of the moon) the changing appearance of the moon during its revolution the orbiting of one object around another revolution around the earth, caused by the relative positions of the earth, Moon, and sun the moon does rotate, the rotation period and revolution period are equal. Elongation the angle of the moon (or a planet) from the sun in the sky. Quarter (phase) the phase of a celestial object when half of its sunlit hemisphere is visible. Gibbous (phase) the phase of a celestial object when between half and all of its sunlit hemisphere is visible full (phase) the phase of a celestial object when the entire sunlit hemisphere is visible. Crescent (phase) the phase of a celestial object when less than half of its sunlit hemisphere is visible.
