"Tuesday, September 11, 2001, dawned temperate and nearly cloudless in the eastern United States."

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When the moon is ninety degrees away from the sun it sees but half the earth illuminated (the western half). For the other (the eastern half) is enveloped in night. Hence the moon itself is illuminated less brightly from the earth, and as a result its secondary light appears fainter to us.

— Galileo Galilei