Part 68 (2/2)

1898, October Multiple hydrogen-bands observed by Campbell in Mira Ceti.

1898, November Orbit of a Leonid meteor photographically determined by Elkin.

1899 Publication of Potsdam _Photometric Durchmusterung_, part ii.

1899 Innes's _Reference Catalogue of Southern Double Stars_.

1899 Keeler's 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 Paris section of International Photographic Catalogue.

1901, Feb. 22 Nova Persei discovered by Anderson.

1901, February Variability of Eros announced by Oppolzer.

1901, April 23 Apparition of a great comet at the Cape.

1901 Publication of Pickering's _Photometric Durchmusterung_.

1901 Miss Cannon's discussion of the spectra of 1,122 Southern stars.

1901 Kapteyn's investigation of mean stellar parallax.

1901 Campbell's determination of the sun's velocity.

1901 Porter's research on the solar motion in s.p.a.ce.

1901 Bigelow's magnetic theory of the solar corona.

1901 Hussey's measurements of the Pulkowa double stars.

1901 Radial velocities of the components of Delta Equulei measured at Lick.

1901, April 16 Death of Henry A. Rowland.

1901, June Nebular spectrum derived from Nova Persei.

1901, Aug. 23 Nebula near Nova Persei photographed by Max Wolf.

1901, Sept. 20 The same exhibited in spiral form on a plate taken by Ritchey at the Yerkes Observatory.

1901, Nov. 8 Photograph taken by Perrine with the Crossley reflector showed nebula in course of rapid change.

1901, Sept. 19 Unveiling of the McClean ”Victoria” telescope at the Royal Observatory, Cape of Good Hope.

1901 Sun-spot minimum.

<script>