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Hipparchus - Crystalinks (6093 words) |
 | Also it is known that the Babylonian priest known as Berossus wrote around 281 BC a book in Greek on the (rather mythological) history of Babylonia, the Babyloniaca, for the new ruler Antiochus I; it is said that later he founded a school of astrology on the Greek island of Kos. |
| After that, in 135 BC, enthusiastic about a nova in the constellation of Scorpius, he measured with an equatorial armillary sphere ecliptical coordinates of about 1,000 stars (the exact number is not known) for his star catalogue. |
| Hipparchus had in 134 BC ranked stars in six magnitude classes according to their brightness: he assigned the value of 1 to the twenty brightest stars, to weaker ones a value of 2, and so forth to the stars with a class of 6, which can be barely seen with the naked eye. |
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Hipparchus (6430 words) |
| Hipparchus (Greek Ἳππαρχος) (circa 190 BC – circa 120 BC) was a Greek astronomer, geographer, and mathematician. |
| After that in 135 BC, enthusiastic about a nova star in the constellation of Scorpius, he measured with an equatorial armillary sphere ecliptical coordinates of about 850 (falsely quoted elsewhere as 1600 or 1080) and in 129 BC he made first big star catalogue. |
| Hipparchus had in 134 BC ranked stars in six magnitude classes according to their brightness: he assigned the value of 1 to the 20 brightest stars, to weaker ones a value of 2, and so forth to the stars with a class of 6, which can be barely seen with the naked eyes. |
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