History
The ancient Greek astronomers noted the apsidal precession of the Moon's orbit; the precession of the solar apsides was discovered in the eleventh century by al-Zarqālī. These remained difficult to account for until the 19th century.
Read more about this topic: Apsidal Precession
Famous quotes containing the word history:
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There are only two great currents in the history of mankind: the baseness which makes conservatives and the envy which makes revolutionaries.”
—Edmond De Goncourt (1822–1896)
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