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 (1919)
Astronomical Society of the Pacific, Aitken, Robert Grant, 1864-1951 · San Francisco Stanford University Press · leaf 202
redlight) so we may say, for the purposes of illustration, thatblue light is about an octave higher in pitch than red light.Some of you may perhaps have been on a railroad train whenanother train was passing in the opposite direction, and sound-ing its whistle as it passed. On such an occasion it… … PLATE XXIX. M. 33 Trianguli. Photographed by J. E. Keclcr, Crosslcy Reflector, Sept. 12, 1899. Astronomical Discovery 123 at which the trains are moving makes the pitch of the soundhigher when they are approaching, and lower when they arereceding from each other. Similarly, if a star is…
Astronomy
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