Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 94
hwabe oi Dessau in 1838. The subject has sinceattracted much attention, and the period, so far asit is constant, has been pretty accurately determinedby WOLF of Ziirich to be a little more than elevenyears ; but the physical cause of the periodicity is notyet satisfactorily explained. A recent… … THE SUN (from a photograph by RuTHERFURD)(Faculae are shown adjacent to tJie spots near the Suns limb) Spoerer from the spots alone. The slowing down as thepoles are approached is remarkably verified, his results giving,for the rotation period at latitude 750, no less than 3Sd-54.If. Duners…
Astronomy
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