ckground crowded with stars.
1882, Dec. 6 Transit of Venus.
1882 Duplication of Martian canals observed by Schiaparelli.
1882 Completion by Loewy at Paris of first equatoreal Coude.
1882 Rigidity of the earth concluded from tidal observations
by G. H. Darwin.
1882 Experiments by Huggins on photographing the corona
without an eclipse.
1882 Publication of Holden's _Monograph of the Orion Nebula_.
1883, Jan. 30 Orion Nebula photographed by Common.
1883, May 6 Caroline Island eclipse.
1883, June 1 Great comet of 1882 observed from Cordoba at a distance
from the earth of 470 million miles.
1883 Parallaxes of nine southern stars measured by Gill
and Elkin.
1883 Catalogue of the spectra of 4,051 stars by Vogel.
1884, Jan. 25 Return to perihelion of Pons's comet.
1884 Photometric Catalogue by Pickering of 4,260 stars.
1884 Publication of Gore's Catalogue of Variable Stars.
1884 Publication of Faye's _Origine du Monde_.
1884, Oct. 4 Eclipse of the moon. Heat-phases measured by Boeddicker
at Parsonstown.
1884 Duner's Catalogue of Stars with Banded Spectra.
1884 Backlund's researches into the movements of
Encke's comet.
1885, February Langley measures the lunar heat-spectrum.
1885 Publication of _Uranometria Nova Oxoniensis_.
1885, Aug. 17 New star in Andromeda nebula discerned by Gully.
1885, Sept. 5 Thollon's drawing of the solar spectrum presented to the
Paris Academy.
1885, Sept. 9 Solar eclipse visible in New Zealand.
1885, Nov. 16 Photographic discovery by Paul and Prosper Henry of
a nebula in the Pleiades.
1885, Nov. 27 Shower of Biela meteors.
1885 Thirty-inch achromatic mounted at Pulkowa.
1885 Publication of Rowland's photographic map of the normal
solar spectrum.
1885 Bakhuyzen's determination of the rotation period of
Mars.
1885 Stellar photographs by Paul and Prosper Henry.
1886, Jan. 26 Spectra of forty Pleiades simultaneously photographed
at Harvard College.
1886, Feb. 5 First