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 329
n-crease. The whole amount of change takes place inabout nine hours, so that the complete length of aperiod is not quite three days; more accurately,2d 2oh 48™ 5 5 s.4. Spectroscopic observations haveproved that these variations are caused by the regularinterposition of an opaque body revolving… … SCHONFELD (1828-1891) The Fixed Stars 271 about 150 stars are now known to be variable, and theapplication of photometry as an accurate means ofmeasuring the amount of light of a star is constantlyincreasing this number. In many cases the variabilityis confined within narrow limits; in others, the…
Astronomy
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