# Hipparchus

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**Hipparchus of Nicaea** (c. 190 – c. 120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes.

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## Quotes

[edit]- I have composed a book on the length of the year in which I show that the tropical year contains 365 days plus a fraction of a day which is not exactly 1/4 days as the mathematicians-astronomers suppose, but which is less than 1/4 by about 1/300.
- Hipparchus from Ptolemy, Almagest
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- Hipparchus from Ptolemy, Almagest