astronomy lecture 5

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1
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what did aristarchus develop

earth moon system - using a lunar eclipse to measure the size of earth

2
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what is the earth moon distance

moon is 30 times the size of earth

3
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how is the distance measured to the moon today

with lasers bouncing off a mirror on the moon

4
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theory about the moons phases

caused by its orbit around Earth, which changes the portion of its sun-illuminated side that is visible to us