Wednesday, September 28, 2011

Sunspots and the Earth's rotation

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Saturday, September 17, 2011

What is the brightness of the moon during the month?

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A full moon is very bright. So bright that you can read a book by its light. The moon the day before or after is almost as bright, at least it seems to be perfectly round and only a fraction of a percent is not lit, so how much can the brightness change? Actually a lot. Similarly, half moon, is not half the brightness of a full moon but much much less.