## What Shape is a Crescent Moon?

The Moon is low in the sky shortly after sunset or before dawn; the bright part of its surface forms a beautiful creation. The two curves that form the boundary of the crescent resemble arcs of circles, and are often drawn that way. Assuming the Moon to be a perfect sphere, and the Sun’s rays to be parallel, *are *they arcs of circles?

Ref: Prof Ian Stewart’s Cabinet of Mathematical Curiosities.

More later,

Nalin Pithwa

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