Jacobus Kapteijn
Dutch astronomer born in 1851. Extensively studied the Milky Way & discovered evidence for galactic rotation.
Johannes Kepler
German astronomer, mathematician, astrologer, & key figure in the 17th-century scientific revolution.
Edwin Hubble
American astronomer born in 1889. Helped establish fields of extragalactic astronomy & observational cosmology.
Edmond Halley
English astronomer, geophysicist, mathematician, & physicist born in 1656. Halley’s Comet is named after him.
Edouard Roche
French astronomer & mathematician born in 1820 & known for his work in celestial mechanics.
Giorgio Abetti
Italian solar astronomer born in 1882. Crater Abetti on the moon is named after him.
Jean-Baptiste Morin
French mathematician, astrologer, & astronomer known for being a critic of Galileo & Descartes.
John Flamsteed
English astronomer & the first Astronomer Royal, born in 1646.
Percival Lowell
American businessman, author, mathematician, & astronomer born in 1855. Began the effort of discovering Pluto.
Ernest Esclangon
French astronomer & mathematician born in 1876. Initiated the first telephone speaking clock in 1933.