Hipparchus of Nicaea
Sciences & Discovery • Historical Archive • 🇹🇷 Turkey • 8 views

Hipparchus of Nicaea 🇹🇷

Ἵππαρχος ὁ Νικαεύς (Known as "Father of Trigonometry & Observational Astronomy")
Astronomer, Mathematician, Geographer, Pioneer of Trigonometry
Born c. 190 BCE 🇹🇷 Nicaea (İznik), Turkey
Passed Away c. 120 BCE Rhodes, Greece
Lifespan ~70 years old
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Notice / Correction
"The stars in their courses obey mathematical law, precessing slowly through the ages."

Archival Overview

Greatest observational astronomer of antiquity, who discovered the precession of the equinoxes, compiled the first comprehensive star catalog, and founded trigonometry.

Biographical Record

Hipparchus of Nicaea (c. 190–120 BCE) conducted decades of meticulous astronomical observations from the island of Rhodes. Comparing his celestial coordinates with observations made 150 years earlier by Timocharis, he discovered the slow wobble of the Earth's rotational axis—the precession of the equinoxes.

He compiled a star catalog of at least 850 stars, inventing the system of apparent stellar magnitudes (ranking brightness from 1st to 6th magnitude) still used today. To solve planetary calculations, he constructed the first table of trigonometric chords, making him the recognized father of trigonometry.

Key Life Milestones

134 BCE

Discovery of Precession & Star Catalog

Discovered the precession of the equinoxes following observation of a new star in Scorpius and charted 850 stars.

c. 127 BCE

Construction of the First Table of Chords

Invented plane trigonometry by compiling mathematical tables calculating chord values across circles.

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Final Resting Place

Perpetual Memorial
Ancient Rhodes Observatory Memorial
Rhodes, Greece
GPS: 36.4442, 28.2253
View on Memory Atlas
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