A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 159
. 254. Stars that appear double when viewed through aglass of low power are often separated by one of higherpower into triple, quadruple, or other multiple stars. Thus, e Lyras, with very slightoptical assistance, is resolved intotwo stars, each of which is aclose double star; and 6 Orionis(Theta… … 6 OBIONIS. TRAPEZIUM OF ORION. 255. Variable Stars are those which exhibit periodi-cal changes of brightness. The number of such starsdiscovered up to the present time (1S70) is about 120.They are sometimes called Periodic Stars. One of the most remarkable of these stars, and the first noticed(by…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
