Adrien Auzout

Adrien Auzout (28 January 162223 May 1691) was a French astronomer.

He was born in Rouen, France, the eldest child of a clerk in the court of Rouen. His educational background is unknown, although he may have attended the Jesuit college in Rouen. Adrien left for Paris during the 1640s, where he developed an interest in astronomy and became well known in academic circles. He was elected a Fellow of the Royal Society of London in 1666.

Auzout made contributions in telescope observations, including perfecting the use of the micrometer. He made many observations with large aerial telescopes and he is noted for briefly considering the construction of a huge aerial telescope 1,000 feet in length that he would use to observe animals on the Moon. In 1647 he performed an experiment that demonstrated the role of air pressure in function of the mercury barometer. In 1667–68, Auzout and Jean Picard attached a telescopic sight to a 38-inch quadrant, and used it to accurately determine positions on the Earth.

Auzout, the Moon crater, is named after him.

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