. 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. escope. alx)ut 450 comets havebeen discovered, and the half of these have been found in thelast fifty years. What we may call the golden age of cometdiscovery included the two decades, 1888 to 1908, when 100comets, an average of five per year, were discovered. FourAmerican observers. Swift, Brooks, Barnard and Perrine,announced the arrival of thirty-seven of these 100 comets. All of the early comets were visible to the naked ey
. 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. escope. alx)ut 450 comets havebeen discovered, and the half of these have been found in thelast fifty years. What we may call the golden age of cometdiscovery included the two decades, 1888 to 1908, when 100comets, an average of five per year, were discovered. FourAmerican observers. Swift, Brooks, Barnard and Perrine,announced the arrival of thirty-seven of these 100 comets. All of the early comets were visible to the naked eye. Onlya small fraction of recent comets, perhaps one in four, becomebright enough for the unassisted eye to see the head, andperhaps one in eight or ten for the unassisted eye to see thetail. Computed comet orbits have become increasingly accu-rate, partly because of greater telescopes, which enable thesebodies to be more accurately observed and observed throughlonger arcs of their orbits. 2. Another decisive argument for the theory that cometsare at home in the solar system is this: Schiaparelli showedin the early 70s that, owing to the Suns motion through the. Fig. 1—Donatis comet, 1858, Oct. 5 ; head and beginning of tail; brilliantstellar nucleus near center of head; envelopes surrounding nucleuson side toward the Sun. White circle to the left represents com-parative size of the Earth.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19
