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What instrument measures the angle of the sun with the horizon?
A sextant.the sextonan astrolabe
What is a Astrolabe Compass?
its a compass of course! that can be used to map out the sun,moon and other types of planets
What replaced the replaced the astrolabe as a tool for measuring a star's angle at which it appears above the northern horizon?
The sextant.
What did Abu Rayhan al-Biruni invent?
Abu Rayhan al-Biruni invented Orthographical astrolabe in the 11th century.
What contributions did we get from Muslims in science?
Muslims were great scientists. Muslim scientists who studied the heavens perfected the astrolabe. Sailors used it to tell what longitude:latitude and where they were on the Earth. When they used the astrolabe to measure the Earth, they realized that it was round. The Muslims were the first to discover this. They experimented with metals and kept records of their work. As a result, they classified themselves as chemists, or the founders of chemistry. Also, Al-Razi was the first to categorize animals, veggies, and minerals. He wrote books for doctors to help them to identify diseases.
