. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. PLATE XI. Hallevs Comet. June 6 and June 7, ^lis by H. D. Curtis. \\tt.\t \\e Know About Co:\iets 47 Meteors of August Orbits of 9, 10, 11 Comet 1862III Perihelion passage July August Longitude of perihelion 343° 38 344° 41 Ascending node 138 16 137 27 Inclination 63 3 66 25 Perihelion distance Period of revolution 105 years? Direction of motion retrograde retrograde The difference i
. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. PLATE XI. Hallevs Comet. June 6 and June 7, ^lis by H. D. Curtis. \\tt.\t \\e Know About Co:\iets 47 Meteors of August Orbits of 9, 10, 11 Comet 1862III Perihelion passage July August Longitude of perihelion 343° 38 344° 41 Ascending node 138 16 137 27 Inclination 63 3 66 25 Perihelion distance Period of revolution 105 years? Direction of motion retrograde retrograde The difference in the two perihelion times does not meanthat their orbits were different even to the minutest degree,but only that, moving on the same orbit, they reached thepoint nearest the Sun at slightly different times; that is, themeteors traveled over the orbit a little in advance of thecomet. The revolution period assigned to the meteors issubject to considerable error because it is not possible toobserve the paths of the meteors with great accuracy. There were rich and startling showers of meteors onNovember 12, 1799, and on November 12-13, 1833. H. examined
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