## What is Hipparchus famous for?

Hipparchus, also spelled Hipparchos, (born, Nicaea, Bithynia [now Iznik, Turkey]—died after 127 bce, Rhodes?), Greek astronomer and mathematician who made fundamental contributions to the advancement of astronomy as a mathematical science and to the foundations of trigonometry.

**What did Hipparchus Catalogue?**

Hipparchus’s catalogue was compiled with naked-eye observations and the few instruments available at the time (gnomons, astrolabes, and armillary spheres). It lists the positions of 850 stars with a precision of less than one degree [1].

**What is the Hipparchus catalog number?**

The Hipparcos catalog has positions for 118,218 stars that are accurate to 1 to 3 milliarcseconds. The Tycho-2 catalog is less accurate (10 to 100 milliarcseconds) but has positions for 2,539,913 stars.

### Who is known as the father of trigonometry?

The first known table of chords was produced by the Greek mathematician Hipparchus in about 140 BC. Although these tables have not survived, it is claimed that twelve books of tables of chords were written by Hipparchus. This makes Hipparchus the founder of trigonometry.

**How many stars did Hipparchus have in his globe?**

In 130 BC, Hipparchus created a star catalog of about 850 stars. He additionally constructed a celestial globe, presenting the constellations and stars arranged on a sphere. In 130 BC, Hipparchus created a star catalog of about 850 stars.

**Who was Hipparchus and what did he do?**

Hipparchus of Nicaea (c. 190 – c. 120 bc) was an astronomer, geographer, and mathematician. Hipparchus is considered the founder of trigonometry, but is most known for his incidental discovery of the precession of the equinoxes.

## Where did Hipparchus live in the Hellenistic period?

Hipparchus ( Greek Ἵππαρχος; ca. 190 BC – ca. 120 BC) was a Greek astronomer, geographer, and mathematician. He lived in the Hellenistic period. Hipparchus was born in Nicaea (now Iznik, Turkey ), and probably died on the island of Rhodes.

**How did Hipparchus calculate the location of the Sun?**

Hipparchus discovered a method of using the dates of two equinoxes and a solstice to calculate the size and direction of the displacement of the Sun’s orbit. With Hipparchus’s mathematical model, one could calculate not only the Sun’s orbital location on any date, but also its position as seen from Earth.