The Major events in Astronomy

Bing Bang

13,000 BCE

Sometime between 13 and 20 billion years ago. The center of the Universe. The Big Bang probably occurred.

Aristarchus suggests the Earth revolves around the Sun.

280 BCE

He provides first estimation of Earth-Sun distance.

Eratosthenes measures the circumference of the earth with surprising accuracy!

240 BCE

Hipparchus develops the first acccurate star map and star catalogue with over 850 of the brightest stars.

130 BCE

Ptolemy suggests geocentric theory of the universe

140

Copernicus publishes his heliocentric theory of the Universe.

Sep 13, 1543

Galileo uses telescope for astronomical purposes

Sep 13, 1609

He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy.

Kepler's First and Second Laws of Planetary Motions are announced.

Sep 13, 1609

The Third Law of Planetary Motion is announced by Kepler in his work Harmonice Mundi

Sep 13, 1619

Christian Huygens discovers Saturn's rings and Titan, the fourth satellite of Saturn.

Sep 13, 1656

The discovery of Uranus by Herschel

Sep 13, 1781

Piazzi discovers first asteroid, Ceres.

Sep 13, 1801

Sputnik

Sep 13, 1957

First object to orbit the Earth, launched by the Russians.

U.S.A. Explorer 1 launched

Sep 13, 1958

This was the first U.S. satellite to orbit the Earth.

Yuri Gagarin becomes the first man in space!

Sep 13, 1961