The Amateur Astronomer
The Amateur Astronomer
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In our eReader you can find the full English version of the book. Read The Amateur Astronomer Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Amateur Astronomer
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In the years from 1828 to 1831 it was too difficult even for this instrument, and trustworthy measures first begin again in 1834. Altogether, since its first discovery, the com- DOUBLE STARS 101 panion star has completed almost four revo- lutions round the principal star, and its period is therefore fairly accurately known. At the present time, when the companion is again very close to the principal, it is a very difficult object. Its distance is somewhat over cr8 second of arc. The apparent ma...gnitude of the principal star is 3*0, its colour yellow; the companion ranks about 6-5 magnitude and is of-^-i ^I'iJsh/ green tint. The period of revolution* ofthjs 3ysie>rn is 33-9 years. ^ . ''', . :, -', '/' Ursae Majoris is also a very difficult object, and can be separated only by the more power- ful instruments. The principal and companion stars are of 5'O and 5-6 magnitude respectively, with a distance between them at present of only O'3 second of arc. 9 Orionis, called the " Trapezium in Orion, " as seen in a 4-inch telescope, consists of four stars, of which the brightest is of 47, the faintest of 8 magnitude.
What to read after The Amateur Astronomer?
You can find similar books in the "Read Also" column, or choose other free books by Gideon Riegler to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the years from 1828 to 1831 it was too difficult even for this instrument, and trustworthy measures first begin again in 1834. Altogether, since its first discovery, the com- DOUBLE STARS 101 panion star has completed almost four revo- lutions round the principal star, and its period is therefore fairly accurately known. At the present time, when the companion is again very close to the principal, it is a very difficult object. Its distance is somewhat over cr8 second of arc. The apparent ma...gnitude of the principal star is 3*0, its colour yellow; the companion ranks about 6-5 magnitude and is of-^-i ^I'iJsh/ green tint. The period of revolution* ofthjs 3ysie>rn is 33-9 years. ^ . ''', . :, -', '/' Ursae Majoris is also a very difficult object, and can be separated only by the more power- ful instruments. The principal and companion stars are of 5'O and 5-6 magnitude respectively, with a distance between them at present of only O'3 second of arc. 9 Orionis, called the " Trapezium in Orion, " as seen in a 4-inch telescope, consists of four stars, of which the brightest is of 47, the faintest of 8 magnitude.
What to read after The Amateur Astronomer?
You can find similar books in the "Read Also" column, or choose other free books by Gideon Riegler to read onlineMoreLess
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