“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.”
Quote by Galileo Galilei
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Source: The Life and Letters of John Keats
Source: The Middle Works of John Dewey, 1899-1924, Volume 5: Ethics: 1908
