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
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“All things are moral. That soul, which within us is a sentiment, outside of us is a law. We feel its inspiration; out there in history we can see its fatal strength.”
—Ralph Waldo Emerson (1803–1882)
“the future is simply nothing at all. Nothing has happened to the present by becoming past except that fresh slices of existence have been added to the total history of the world. The past is thus as real as the present.”
—Charlie Dunbar Broad (1887–1971)
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—Thomas Henry Huxley (1825–95)