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© Sierra College Astronomy Department

10

Hipparchus

A discovery of a “new” star in 134 B.C. prompted him to make a catalogue of the brighter stars

The led to another discovery: precession of the poles

Hipparchus noticed the vernal equinox drifted westward 1° every 78 years implying it would take 26,000 years to travel the full cycle of 360° along the ecliptic

This was due to the earth’s poles slow movement on the celestial sphere, completing a loop in about 26,000 years

Ancient Astronomy Hipparchus

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