Dutch astronomer born in 1851. Extensively studied the Milky Way & discovered evidence for galactic rotation.
GermanÂ astronomer,Â mathematician, astrologer, & key figure in the 17th-centuryÂ scientific revolution.
American astronomer born in 1889. Helped establish fields of extragalactic astronomy & observational cosmology.
English astronomer, geophysicist, mathematician, & physicist born in 1656. Halley’s Comet is named after him.
French astronomer & mathematician born in 1820 & known for his work in celestial mechanics.
Italian solar astronomer born in 1882. Crater Abetti on the moon is named after him.
FrenchÂ mathematician,Â astrologer, &Â astronomer known for being a critic of Galileo & Descartes.
English astronomer & the first Astronomer Royal, born in 1646.
American businessman, author, mathematician, & astronomer born in 1855. Began the effort of discovering Pluto.
French astronomer & mathematician born in 1876. Initiated the first telephone speaking clock in 1933.