Famous Astronomers

The pioneers who shaped our understanding of the cosmos.

300 BC

1 AD

500

1000

1400

1600

1700

1800

1900

2000

Aristarchus of Samos · 310 BC – 230 BC

Hipparchus · 190 BC – 120 BC

Ptolemy · 100 – 170

Aryabhata · 476 – 550

Abd al-Rahman al-Sufi · 903 – 986

Ulugh Beg · 1394 – 1449

Nicolaus Copernicus · 1473 – 1543

Tycho Brahe · 1546 – 1601

Galileo Galilei · 1564 – 1642

Johannes Kepler · 1571 – 1630

Giovanni Cassini · 1625 – 1712

Christiaan Huygens · 1629 – 1695

Isaac Newton · 1643 – 1727

Edmond Halley · 1656 – 1742

Charles Messier · 1730 – 1817

Wilhelm Herschel · 1738 – 1822

Giuseppe Piazzi · 1746 – 1826

Caroline Herschel · 1750 – 1848

Friedrich Bessel · 1784 – 1846

Joseph von Fraunhofer · 1787 – 1826

Friedrich Wilhelm August Argelander · 1799 – 1875

William Huggins · 1824 – 1910

Edward Emerson Barnard · 1857 – 1923

Annie Jump Cannon · 1863 – 1941

Henrietta Swan Leavitt · 1868 – 1921

George Ellery Hale · 1868 – 1938

Ejnar Hertzsprung · 1873 – 1967

Albert Einstein · 1879 – 1955

Edwin Hubble · 1889 – 1953

Cecilia Payne-Gaposchkin · 1900 – 1979

Clyde Tombaugh · 1906 – 1997

Subrahmanyan Chandrasekhar · 1910 – 1995

Vera Rubin · 1928 – 2016

Carl Sagan · 1934 – 1996

Jocelyn Bell Burnell · 1943

Ancient World

Hipparchus

190 BC – 120 BC

First star catalog and stellar magnitude system

Ptolemy

100 – 170

The Almagest — definitive astronomical reference for 1,400 years

Aristarchus of Samos

310 BC – 230 BC

First to propose a heliocentric model of the solar system

Aryabhata

476 – 550

Calculated Earth's rotation, eclipses, and the value of pi

Medieval

Abd al-Rahman al-Sufi

903 – 986

First to record the Andromeda Galaxy; revised Ptolemy's star catalog

Ulugh Beg

1394 – 1449

Star catalog, Samarkand Observatory

Renaissance

Nicolaus Copernicus

1473 – 1543

Proposed the heliocentric model of the solar system

Tycho Brahe

1546 – 1601

Most accurate pre-telescope observations; discovered a supernova

Galileo Galilei

1564 – 1642

First telescopic observations: Jupiter's moons, lunar craters, Saturn's rings

Johannes Kepler

1571 – 1630

Three laws of planetary motion; explained elliptical orbits

Early Modern

Giovanni Cassini

1625 – 1712

Discovered four Saturn moons and the Cassini Division

Christiaan Huygens

1629 – 1695

Discovered Titan; first to correctly describe Saturn's rings

Edmond Halley

1656 – 1742

Predicted the return of Halley's Comet; cataloged southern stars

Isaac Newton

1643 – 1727

Laws of gravitation and motion, reflecting telescope, Principia Mathematica

18th Century

Charles Messier

1730 – 1817

Created the Messier catalog — the essential list for amateur deep-sky observing

Wilhelm Herschel

1738 – 1822

Discovery of Uranus, infrared radiation, deep sky surveys

Caroline Herschel

1750 – 1848

Discovered 8 comets and 14 nebulae; first professional woman astronomer

Giuseppe Piazzi

1746 – 1826

Discovered the first asteroid, Ceres

19th Century

Friedrich Wilhelm August Argelander

1799 – 1875

Created the Bonner Durchmusterung — the most comprehensive star catalog of the 19th century

Annie Jump Cannon

1863 – 1941

Classified 350,000+ stellar spectra; created the spectral classification system

Henrietta Swan Leavitt

1868 – 1921

Discovered the period-luminosity relation of Cepheid variables

Joseph von Fraunhofer

1787 – 1826

Discovered absorption lines in the solar spectrum, pioneered spectroscopy

Friedrich Bessel

1784 – 1846

First to measure the distance to a star by parallax

William Huggins

1824 – 1910

Pioneer of astronomical spectroscopy — proved nebulae are gaseous

Edward Emerson Barnard

1857 – 1923

Discovered Barnard's Star, pioneer of astrophotography

20th Century

Edwin Hubble

1889 – 1953

Proved galaxies exist beyond the Milky Way; discovered the expanding universe

Clyde Tombaugh

1906 – 1997

Discovered Pluto through painstaking photographic plate comparison

Carl Sagan

1934 – 1996

Made astronomy accessible to millions through Cosmos; pioneer of planetary science

Vera Rubin

1928 – 2016

Provided the first strong evidence for dark matter through galaxy rotation curves

Albert Einstein

1879 – 1955

General relativity — reshaped our understanding of gravity, space, and time

George Ellery Hale

1868 – 1938

Greatest telescope builder of the 20th century

Ejnar Hertzsprung

1873 – 1967

Co-creator of the Hertzsprung-Russell diagram

Cecilia Payne-Gaposchkin

1900 – 1979

Proved that stars are composed primarily of hydrogen and helium

Subrahmanyan Chandrasekhar

1910 – 1995

Chandrasekhar limit — maximum mass of a white dwarf star

Jocelyn Bell Burnell

b. 1943

Discovered pulsars as a graduate student

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