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The astrolabe, for over one thousand years told Arabs and others, by calculating the positions of the stars, in which direction they were heading, and in which direction to pray. It also told the exact times of sunrises and sets, and it determined the period of fasting during Ramadan.
Another innovation was the development of tables that showed the exact positions of some planets, and the precession of the equinoxes. Observing the equinoxes made it possible to determine the length of the solar year with unbelievable accuracy, as well as arriving at figures for the longitudes and latitudes of certain places, that had only a small margin of error...
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