ast3018lecture2 - Motion of the Moon Line of Nodes E a s t...

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1 Motion of the Moon East to west in arc across sky Eastward w.r.t. stars - half degree per hour Sidereal Period - 27.32166 days Line of Nodes Moon rises ~ 50 minutes later each day Phases of the Moon Why does the Moon Shine? Reflected sunlight Half of the Moon is always lit up Fraction of lit surface we see from Earth - phase How much of the Moon is lit up by Sun? Synodic Period - 29.530588 days Sidereal Period: 27.3 days Synodic Period: 29.5 days Phases of the Moon The changes in the Moon’s phase are due to changes in the angle between the Sun, Moon and the Earth – 0 degrees : New Moon – 90 degrees: Quarter Moon (First or Third) – 180 degrees: Full
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2 Question • If the Sun sets at 6pm, when does a first quarter Moon rise? A First Quarter Moon rises at noon Eclipses • A solar eclipse occurs when the Moon moves between the Earth and the Sun • A lunar eclipse occurs when the Earth moves between the Sun and the Moon and the Moon moves through the Earth’s shadow • In ancient cultures eclipses were bad omens The Moon Moves Over the Face of the Sun Nearly Covered The Sun is Nearly Covered
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3 The Diamond Ring Angular Size of Sun and Moon • The Sun and Moon have very different physical sizes – Radius of Sun is 7x10 5 km – Radius of Moon is 1.7x10 3 km – So the Sun is 400 times bigger than the Moon!! • How can they appear to be nearly the
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This note was uploaded on 07/28/2011 for the course AST 3018 taught by Professor Lada during the Fall '08 term at University of Florida.

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ast3018lecture2 - Motion of the Moon Line of Nodes E a s t...

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