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 = E + syn ⇒ω sid = E + 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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This note was uploaded on 04/23/2011 for the course ASTR 364 taught by Professor Cui,weik. during the Spring '11 term at Purdue.

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

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