Al-Marwazi I The champion of astronomy and
Meet Ahmad ibn 'Abdallah Hasib Marwazi, a pioneering 9th-century astronomer."
"From 825 to 835, he made significant astronomical observations and compiled three zijes, or astronomical tables."
"His first tables followed the Hindu tradition, while his second, the 'tested' tables, were the most important and likely part of the collective work of al-Ma'mun's astronomers."
"In 829, he recorded the first instance of determining time by the sun’s altitude during a solar eclipse, a method widely adopted by Muslim astronomers."
"In 830, Al-Marwazi introduced the concept of 'shadow', equivalent to the tangent in trigonometry, and created the first tables of tangents and cotangents."
"At the Al-Shammisiyyah observatory in Baghdad, he compiled 'The Book of Bodies and Distances', detailing his geographic and astronomical findings."
"Al-Marwazi—astronomer, mathematician, and innovator. His contributions continue to influence astronomy and mathematics."
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