lecture_tan4 - Key Concepts: Lecture 4 The Moon Moves Over...

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Key Concepts: Lecture 4 Solar Eclipses Angular Size Lunar Eclipses 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 The Sun is Nearly Covered
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Total Solar Eclipse 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 same size during an eclipse? Angular Size Answer: the Moon and Sun, coincidentally, have nearly the same angular size Angular size of an object depends on two things – The physical size of the object – The distance to the object Angular size (measured in radians) = Physical Size Distance s r or we write it as: ! (2
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This note was uploaded on 09/07/2011 for the course AST 1002 taught by Professor Dr.haywoodsmith,jr during the Spring '07 term at University of Florida.

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lecture_tan4 - Key Concepts: Lecture 4 The Moon Moves Over...

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