The Call of the Stars; a Popular Introduction to a Knowledge of the Starry Skies With Their Romance And Legend
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In our eReader you can find the full English version of the book. Read The Call of the Stars; a Popular Introduction to a Knowledge of the Starry Skies With Their Romance And Legend 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 Call of the Stars; a Popular Introduction to a Knowledge of the Starry Skies With Their Romance And Legend
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238 The Call of the Stars The star Algol is the most notable variable in the heavens, and, unlike Mira Ceti, runs through its cycle of variations not in months but in days. Its period has been determined with great exactness, so that its minima of brightness admit of easy prediction. It changes from the second to the third magnitude and back again once in about every three days (2 days, 20 hours, 48 minutes, and 55 seconds) , and at its period of lowest brilliancy loses about three-fourths of i...ts light.
Its variability is apparently due to a huge, relatively dark body, partially eclipsing its light (just as the sun's light is cut off by the moon), as the two revolve, at close quarters, around a common centre of gravity, or perhaps about another invisible body, in an orbit turned edgewise to the earth. The distance of the relatively dark star from Algol is estimated at about thirty-two hundred thousand miles.
In the stern of the ship Argo, in the southern hemisphere, there is an Algol variable, both components of which are bright, and are believed to be circling around each other in actual contact.
What to read after The Call of the Stars; a Popular Introduction to a Knowledge of the Starry Skies With Their Romance And Legend?
You can find similar books in the "Read Also" column, or choose other free books by John R John Robert Kippax to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
238 The Call of the Stars The star Algol is the most notable variable in the heavens, and, unlike Mira Ceti, runs through its cycle of variations not in months but in days. Its period has been determined with great exactness, so that its minima of brightness admit of easy prediction. It changes from the second to the third magnitude and back again once in about every three days (2 days, 20 hours, 48 minutes, and 55 seconds) , and at its period of lowest brilliancy loses about three-fourths of i...ts light.
Its variability is apparently due to a huge, relatively dark body, partially eclipsing its light (just as the sun's light is cut off by the moon), as the two revolve, at close quarters, around a common centre of gravity, or perhaps about another invisible body, in an orbit turned edgewise to the earth. The distance of the relatively dark star from Algol is estimated at about thirty-two hundred thousand miles.
In the stern of the ship Argo, in the southern hemisphere, there is an Algol variable, both components of which are bright, and are believed to be circling around each other in actual contact.
What to read after The Call of the Stars; a Popular Introduction to a Knowledge of the Starry Skies With Their Romance And Legend?
You can find similar books in the "Read Also" column, or choose other free books by John R John Robert Kippax to read onlineMoreLess
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