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Earth Shape and Constellations

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How do we know the earth is spherical?

Where is the ecliptic and what constellations are along there?

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Solution Summary

The 3 pages solution provides several ways to show the world is indeed spherical.

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The solution is attached below in two files. the files are identical in content, only differ in format. The first is in MS Word XP Format, while the other is in Adobe pdf format. Therefore you can choose the format that is suitable to you.

Check out:
http://www.physlink.com/Education/AskExperts/ae535.cfm
http://en.wikipedia.org/wiki/Ecliptic

And just for laughs:
http://www.flat-earth.org/
http://www.alaska.net/~clund/e_djublonskopf/Flatearthsociety.htm

Proof 1: Line of sight

When a distant object with certain height approaches, we first see the highest point of the object first, and then slowly the rest of the object is revealed as the rest of it clears the earth's curvature.

Proof 2: Lunar eclipse.
When ...

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