<P> Hipparchus of Nicaea ' ( / hɪˈpɑːrkəs / ; Greek : Ἵππαρχος , Hipparkhos ; 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 . </P>
<P> Hipparchus of Nicaea ' ( / hɪˈpɑːrkəs / ; Greek : Ἵππαρχος , Hipparkhos ; 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 . </P>
who is known as the father of trigonometry
who is known as the father of trigonometry
Hipparchus of Nicaea
Hipparchus of Nicaea