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Brief History of Astronomy

The Beginning?

Period: Between 13 and 20 billion years ago

Lunar and Solar calendars

Period: About 2000 B.C.

Aristarchus of Samos

Period: About 280 B.C.

Armillary Sphere

Period: From 813 A.D. to 833 A.D.

Mural Sextant

Period: 994 A.D.

Nicolaus Copernicus

Period: 1543 A.D.

Hans Lippershey Telescope

Period: 1609 A.D.

Galileo Telescope

Period: 1609 A.D.

Cassini and Mars

Period: 1666 A.D.

Halley's Comet

Period: 1705 A.D.

Doppler Effect

Period: 1842 A.D.

Mount Wilson Observatory

Period: 1905 A.D.

Hubble Law

Period: 1923 A.D.

Constellation Sagittarius

Period: 1927 A.D.

Cosmic Radio Waves

Period: 1933 A.D.

Grote Reber

Period: 1937 A.D.

Sputnik

Period: 1957 A.D.

Yuri Gagarin

Period: 1961 A.D.

Apollo 11

Period: 1969 A.D.

Venera 7

Period: 1970 A.D.

Vikings

Period: 1976 A.D.

Hubble Space Telescope

Period: 1990 A.D.

Cassini-Huygens

Period: 1997 A.D.

NEAR spacecraft

Period: 2001 A.D.