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For early watchers, the red planet stood for blood and violence. The first Mars-watchers saw a small, reddish circle through their telescopes. By 1659, Christopher Huggens, a Dutch astronomer, found out the rotation of Mars, and that it was almost identical to Earth's. Modern calculations have fixed Mars's day to 24 hours, 37 minutes and 30 seconds. In 1666, Giovanni Domenico Cassini, an Italian astronomer who was in charge of King Louis XIV's observatory in Paris, discovered white areas at Mars's poles. Later, it was confirmed that those were polar caps that grew in the course of the Mars's year, just in the same way that Earth's ice caps do. In the beginning of August, the 1877 Asaph Hall begun his search for satellites of Mars. But, at that time, Mars was so close, that it produced a glare, when it was viewed through a telescope. By August 11, Hal was convinced that there was nothing to be found, but his wife urged him on. That night he saw something. It was very small. Then the clouds came. On August 16, the sky was clear again, and there it was! The next day, Hall was thrilled to find another moon. Hall named them Phobos (Fear) and Deimos (Panic) in honour of the war-god's chariot horses. Asaph Hall was not able to find the size of the moons. Later observations have established that Phobos was 12880 km. and Deimos measured only 420 km. |
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