-
The first accurate star map was created with over 850 of the brightest stars.
-
Chinese astronomers observe supernova in Taurus
-
Construction of an observatory in Cairo was begun in 1120 A.D. This is possibly the first observatory built in Medieval Islam. But because the patron of the observatory was found guilty of several crimes he was sentenced to death. It was demolished in 1125.
-
He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy.
-
Asaph Hall discovers Phobos and Deimos, the moons of Mars.