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Astronomy NotesEssay Preview: Astronomy NotesReport this essayAstronomy day/night -> earth spins on axis, repetition of stars and sun very night we see the shape of the moon change.Lunar phases are a consequences of the moons 27.3 orbit around earth (sidereal)Phases of moon 29.5 day cycle (synodic)Which is it ? both depends on reference point Synchronous.