History of Astronomy



1300 B.C.

charted stars and recorded solar and lunar eclipses


700 B.C.

made accurate predictions of planets and their visibility


600 B.C.

developed important ideas about earth, stars, and planets


2 A.D.

wrote about Greek ideas and that the sun circled around the earth

Tycho Brahe

1500 A.C.

analyzed motions of planets and predicted their motions most accurately


1543 A.D.

proposed sun is center of solar system

Hans Lippershey

1608 A.D.

invented telescope by placing simple lenses on the end of a tube

Galileo Galilei

1609 A.D.

Galileo improved the telescope by making a refracting telescope

Johannes Kepler

1609 A.D.

proposed planets orbit the sun in elliptical orbits

Isaac Newton

1668 A.D.

invented reflecting telescope
(had also discovered law of gravitation, explaining motions of planets, comets, and other objects)

William Herschel

1781 A.D.

discovered the planet Uranus

Johann Galle

1846 A.D.

discovered the planet Neptune

Albert Einstein

1905 A.D.

discovered the special theory of relativity

Albert Einstein

1915 A.D.

discovered the general theory of relativity

Edwin Hubble

1929 A.D.

discovered the universe is expanding

Clyde Tombaugh

1930 A.D.

discovered the planet Pluto

Karl Jansky

1931 A.D.

detected radio waves coming from the center of the galaxy

Grote Weber

1937 A.D.

made the radio telescope

Hubble Space Telescope

1990 A.D.

(HST) was launched into space (giant mirror telescope)

Hubble Space Telescope

1993 A.D.

main mirror in telescope was corrected by austronauts

Chandra X-ray Observatory

1999 A.D.

launched into space