lec04 - Lecture 4 Early Astronomy Lecture 4 Purdue...

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Lecture 4 Early Astronomy Lecture 4 Purdue University, Astronomy 364 1
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Greek Astronomy • The Earth is at the center of the universe. • 3-D Universe – Celestial sphere is not a thin dome. – The Sun and the Moon are at different distances. – Celestial bodies are spheres (not disks). – Lunar eclipse occurs when the Moon is in the shadow of the Earth. – Solar eclipse occurs when the Moon blocks the Sun. – Lunar cycle is a geometrical effect related to the fraction of the Sun-lit side of the Moon visible to an observer on the Earth. Lecture 4 Purdue University, Astronomy 364 2
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• Earth is of spherical shape. – Gravity pulls materials toward the center of the Earth, leading to the most compact configuration – sphere. – Partial lunar eclipse always shows an arc on the surface of the Moon. – Appearance of new stars as one travels south toward the equator. – Existence of elephants in the westernmost
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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 University-West Lafayette.

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lec04 - Lecture 4 Early Astronomy Lecture 4 Purdue...

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