Part 65 (1/2)

1862 Solar hydrogen-absorption recognised by ngstrom.

1862, Jan. 31 Discovery by Alvan G. Clark of the companion of Sirius.

1862 Foucault determines the sun's distance by the velocity of light.

1862 Opposition of Mars. Determination of solar parallax.

1862 Completion of _Bonner Durchmusterung_.

1863 Secchi's cla.s.sification of stellar spectra.

1863 Foundation of the German Astronomical Society.

1864, March 5 Rotation period of Mars determined by Kaiser.

1864 Huggins's first results in stellar spectrum a.n.a.lysis.

1864, Aug. 5 Spectroscopic examination of Tempel's comet by Donati shows it to be composed of glowing gas.

1864, Aug. 29 Discovery by Huggins of gaseous nebulae.

1864 Value of 91,000,000 miles adopted for the sun's distance.

1864 Croll's explanation of glacial epochs.

1864, Nov. 23 Death of Struve.

1865, Jan. 4 Spectroscopic observation by Huggins of the occultation of Eta Piscium.

1865, Jan. 16 Faye's theory of the solar const.i.tution.

1865 Kew results published.

1865 Zollner argues for a high temperature in the great planets.

1866 Ident.i.ty of the orbits of the August meteors and of comet 1862 iii. demonstrated by Schiaparelli.

1866 Delaunay explains lunar acceleration by a lengthening of the day through tidal friction.

1866, March 4 Spectroscopic study of the sun's surface by Lockyer.

1866, March 12 New star in Corona Borealis detected by Birmingham.

1866, October Schmidt announces the disappearance of the lunar crater Linne.

1866, Nov. 13 Meteoric shower visible in Europe.

1867 Period of November meteors determined by Adams.

1867, Aug. 29 Total solar eclipse. Minimum sun-spot type of corona observed by Grosch at Santiago.

1867 Discovery of gaseous stars in Cygnus by Wolf and Rayet.

1868, February Principle of daylight spectroscopic visibility of prominences started by Huggins.

1868, Aug. 18 Great Indian eclipse. Spectrum of prominences observed.

1868, Aug. 19 Janssen's first daylight view of a prominence.

1868, Oct. 26 Lockyer and Janssen independently announce their discovery of the spectroscopic method.

1868 Doppler's principle applied by Huggins to measure stellar radial movements.

1868 Publication of ngstrom's map of the normal solar spectrum.

1868 Spectrum of Winnecke's comet found by Huggins to agree with that of olefiant gas.

1869, Feb. 11 Tenuity of chromospheric gases inferred by Lockyer and Frankland.

1869, Feb. 13 Huggins observes a prominence with an ”open slit.”

1869, Aug. 7 American eclipse. Detection of bright-line coronal spectrum.

1870 Mounting of Newall's 25-inch achromatic at Gateshead.

1870 Proctor indicates the prevalence of drifting movements among the stars.

1870 A solar prominence photographed by Young.

1870, Dec. 22 Sicilian eclipse. Young discovers reversing layer.

1871, May 11 Death of Sir J. Herschel.

1871, June 9 Line-displacements due to solar rotation detected by Vogel.

1871, Dec. 12 Total eclipse visible in India. Janssen observes reflected Fraunhofer lines in spectrum of corona.

1872 Conclusion of a three years' series of observations on lunar heat by Lord Rosse.

1872 Spectrum of Vega photographed by H. Draper.

1872 Faye's cyclonic hypothesis of sun-spots.

1872 Young's solar-spectroscopic observations at Mount Sherman.

1872 Cornu's experiments on the velocity of light.

1872, Nov. 27 Meteoric shower connected with Biela's comet.

1873 Determination of mean density of the earth by Cornu and Baille.