Pernter's experiments on scintillation from the
Sonnblick.
1889 H. Struve's researches on Saturn's satellites.
1889 Harkness's investigation of the masses of Mercury,
Venus, and the Earth.
1889 Heliometric measures of Victoria and Sappho at the Cape.
1889, Jan. 1 Total solar eclipse visible in California.
1889, Feb. 7 Foundation of the Astronomical Society of the Pacific.
1889, March Investigation by Sir William and Lady Huggins of
the spectrum of the Orion nebula.
1889, July-Aug. First photographs of the Milky Way taken by Barnard.
1889, August 2 Observation by Barnard of four companions to Brooks's
comet.
1889, Nov. 1 Passage of Japetus behind Saturn's dusky ring observed
by Barnard.
1889, December Schiaparelli announces synchronous rotation and
revolution of Mercury.
1889, Dec. 22 Total eclipse of the sun visible in Guiana. Death of
Father Perry, December 27.
1889 Spectrum of Uranus investigated visually by Keeler,
photographically by Huggins.
1890 Long-exposure photographs of ring-nebula in Lyra.
1890 Determinations of the solar translation by L. Boss
and O. Stumpe.
1890 Schiaparelli finds for Venus an identical period of
rotation and revolution.
1890 Publication of Thollon's map of the solar spectrum.
1890 Bigelow's mathematical theory of coronal structures.
1890 Foundation of the British Astronomical Association.
1890 Measurements by Keeler at Lick of nebular radial
movements.
1890 Janssen's ascent of Mont Blanc, by which he ascertained
the purely terrestrial origin of the oxygen-absorption
in the solar spectrum.
1890 Newcomb's discussion of the transits of Venus of
1761 and 1769.
1890 Spiral structure of Magellanic Clouds displayed in
photographs taken by H. C. Russell of Sydney.
1890 Publication of the Draper Catalogue of Stellar Spectra.
1890, April 24 Spica announced by Vogel to be a spectroscopic binary.
1890, June Gore's Catalogue