See also: Hall
BiographyApprentice in a carpenter at the 16 years age, shortly after it attended the Central College in McGrawville, New York.
In 1856, he worked with the Harvard College Observatory with Cambridge, Massachusetts where it proved to be an expert in the calculation of the orbites.
He became assistant astronomer with the US Naval Observatory at Washington DC in 1862 and a year later he was named professeur.
DiscoveredIn 1875, Hall received the responsibility for a telescope of 66 cm, largest Telescope of the world at that time. Observing a white spot on the Saturn surface, it used it like locates to determine the period of rotation of the planète.
It is especially known to have discovered in 1877 both satellite of Mars, which it named Phobos and Déimos ( Terreur and Frayeur , in Greek). Starting from the same observations, it determined the Masse of Mars.
It determined also the Orbite S of several natural satellite, showing in particular in 1884 displacement Rétrograde of the main roads of the elliptic orbit of Hypérion, one of the moons of Saturn, approximately 20° per annum.
He studied also the Parallaxe and the position of the star S of the cluster of the Pléiades.
- the crater Hall on the the Moon
- the crater Hall on Phobos, satellite of Mars
- the Asteroid (3299) Hall
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