Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
						1      154 years ago, in 1801: Giuseppe Piazzi of Italy discovers the largest asteroid, Ceres.
2	3	4	5      50 years ago, in 1905: At the Lick Observatory, Charles D. Perrine discovers Elara, the eighth largest moon of Jupiter.	6	7      345 years ago, in 1610: Galileo sees three of the four "Galilean" moons of Jupiter for the first time through a telescope.      165 years ago, in 1790: Caroline Herschel discovers her third comet, Comet C/1790 A1 (Herschel).      67 years ago, in 1888: James Edward Keeler is the first to view what is known as the Encke Gap in Saturn's A ring, using the 36 inch telescope at Lick Observatory.	8      313 years ago, in 1642: Galileo Galilei dies at age 77 in Arcetri, Grand Duchy of Tuscany, Italy.      13 years ago, in 1942: Theoretical physicist Stephen William Hawking is born in Oxford, England.
9	10      345 years ago, in 1610: Galileo noticies one of the three "Galilean" moons has disappeared; leading to his belief they were moons.	11      168 years ago, in 1787: William Herschel discovers two moons of Uranus, Oberon and Titania.	12      48 years ago, in 1907: Sergei Korolev, the Soviet "chief designer", is born in Zhytomyr, Russian Empire.	13      345 years ago, in 1610: Galileo discovers the fourth "Galilean" moon of Jupiter.	14	15
16	17      169 years ago, in 1786: Comet 2P/Encke is first viewed by French astronomer Pierre Mechain.	18	19	20	21	22
23	24	25	26      6 years ago, in 1949: The 200-inch Hale Telescope sees "first light".	27      47 years ago, in 1908: Pasiphae, the largest retrograde moon of Jupiter, is discovered by Philibert Jacques Melotte.	28      6 years ago, in 1949: The first flight for X-ray research is made with a U.S. launched V-2, and it detects X-rays from the Sun.	29
30	31      170 years ago, in 1785: NGC 2359 (Thor’s Helmet), a bright nebula in the constellation Canis Major, is discovered by William Herschel.