Asaph Hall

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Asaph Hall (born October 15, 1829 in Goshen, Connecticut, USA) was an American astronomer, best known as the discoverer of two moons Mars (Phobos and Deimos) in 1877. By calculating the orbits of other planets and double stars, he set the rotation of Saturn and the mass of Mars.

He was born in Goshen, Connecticut. From the age of 16 he worked as a craftsman, then went to college in New Hudson. In 1856 he married Angeline Stickney.

In 1856 he began working at the Harvard University Observatory in Cambridge, where he worked on calculating orbits. From 1862 Hall worked at the Naval Observatory in Washington, DC, where he became a professor after a year.

Since 1875 Hall has had the opportunity to conduct observations with a 66 cm diameter telescope, the largest refractor in the world. With his help he set the rotation of Saturn, using a white spot on the surface of the planet. In 1884 he discovered that the apex line of the orbit of one of Saturn's moons, Hyperion, is moving backwards at a speed of 20 degrees per year. Hall also studied parallax and star positions in the open Pleiades. In the years 1896-1901 he worked as a professor at Harvard University in Cambridge.

In 1879, he received the Gold Medal of the Royal Astronomical Society. His name is one of the craters on the Moon.

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