Astronomy in a nutshell, the chief facts and principles explained in popular language for the general reader and for schools (1912)
Serviss, Garrett Putman, 1851-1929, Rouben Mamoulian Collection (Library of Congress) DLC · New York, London, G.P. Putnam's sons · leaf 168
calleda week, which has been used from timeimmemorial, may have originated from thefact that the interval from new moon to thefirst quarter and from first quarter to fullmoon, etc., is very nearly seven days. Butthe week is as incorrigible as all its sistersin the discordant family of time, and… … Spiral Nebula in Ursa Major (M 101) Photographed at the Lick Observatory by J. E. Keeler, with the Crossleyreflector. Exposure four hours.Note the appearance of swift revolution, as if the nebula were throwingitself to pieces like a spinning pin-wheel.
Astronomy
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