photographs of nebulae with the Crossley
reflector and generalization of their spiral
character.
1899, January Spectrum of Andromeda nebula photographed by Scheiner.
1899, April Photographic discovery of Nova Aquilae by Mrs. Fleming.
1899, Aug. 26 Installation of 31-inch photographic refractor at
Potsdam.
1899 Campbell's detection of Polaris as spectroscopically
triple.
1899, October Duplicate discovery by Campbell and Newall of
Capella as a spectroscopic binary.
1899, Nov. 15 Failure of the Leonids. Deflection of the stream
predicted by Johnstone Stoney and Downing.
1899, December Publication of Sir William and Lady Huggins's _Atlas
of Representative Stellar Spectra_.
1899 Thirty-two-inch photographic refractor mounted at
Meudon.
1899 Issue of first volume of Potsdam measures of
international catalogue plates.
1900, Jan. 27 Kapteyn's determination of the apex of solar motion.
1900 Chase's measures for parallax of swiftly-moving stars.
1900 Publication of Gill's _Researches on Stellar Parallax_.
1900 Kapteyn proposes a method for a stellar parallax
Durchmusterung, and gives specimen results for
248 stars.
1900 Burnham's general catalogue of 1,290 double stars.
1900 Publication of the concluding volume of the _Cape
Photographic Durchmusterung_.
1900, May 28 Spanish-American total eclipse of the sun.
1900, July International Conference at Paris. Co-operation
arranged of fifty-eight observatories in measures of
Eros for solar parallax.
1900 Horizontal refractor, of 50 inches aperture, 197 feet
focus, installed in Paris Exhibition.
1900, Aug. 12 Death of Professor Keeler. Succeeded by Campbell
in direction of Lick Observatory.
1900, November Opposition of Eros.
1900 Publication of Roberts's _Celestial Photographs_,
vol. ii.
1900 Complete publication of Langley's researches on the
infra-red spectrum.
1900 Printing begun of Par