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lec09 - Lecture 9 Phases of the Moon Lecture 9 Purdue...

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Lecture 9 Phases of the Moon Lecture 9 Purdue University, Astronomy 364 1
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Important Business HW01 due NOW! HW02 has been posted. Lecture 9 Purdue University, Astronomy 364 2
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Lunar Cycle The orbit of the Moon is tilted only by 5.1 deg from the ecliptic, so it always remains fairly close to the equator. The Moon is aligned with the Earth-Sun line when it is new or full, and is 90 deg away when it is in the first or last quarter. Lecture 9 Purdue University, Astronomy 364 3
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Solar Illumination Lecture 9 Purdue University, Astronomy 364 4
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Sidereal Month The sidereal orbital period of the Moon is shorter than the synodic month, due to the orbital motion of the Earth. Lecture 9 Purdue University, Astronomy 364 5 ω sid = ω E + ω syn ω sid = ω E + ω syn 1 P sid = 1 P E + 1 P syn P sid = 1 365.256 + 1 29.531 1 = 27.322 days
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Rotation of the Moon Tidal force due to the Earth: Synchronization: the rotation is locked to the orbital motion, due to tidal breaking
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