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Scientists and Astronomers [Question 7]

7. Who was Hipparchus?

Hipparchus was born at Nicaea, in Bithynia, in 160 B. C, and died in lived only 35 years. In that short time he gathered together all he could find that was known about the heavens and founded the science of astronomy. Hipparchus remeasured and checked the inclination of the Earth's axis by studying the recorded variations in the place of rising and setting of the Sun at various times of the year, confirming these variations by his own observations. He measured the length of the year. Hipparchus recorded what have been a nova and made the first catalogue of the stars. He drew up tables for the various phases of the Moon and of its positions for years ahead. Hipparchus discovered the precession of the equinoxes. As a mathematician, he also invented trigonometry.

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• The Sun
• The Earth
• The Moon
• Mercury, Venus and Mars
• Jupiter, Saturn, Uranus, Neptune, Pluto
• Meteors and Comets
• Stars
• The Constellations
• Galaxies
Related Internet Links
• Edwin Hubble
• Isaac Newton

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