Astronomy - Sirius - Brightest Diamond in the Night Sky by Jay B. Holberg

By Jay B. Holberg

Of the entire mounted stars within the evening sky, Sirius is by way of some distance the brightest – virtually two times as vivid as its nearest rival, the superstar Canopus, which lies too some distance south to be considered from many of the Northern Hemisphere. in basic terms the sunlight, Moon and the planets Venus, Jupiter and, every now and then, Mars, seem brighter. Sirius, with its flashing brilliance, is a notable characteristic of the northern wintry weather sky and has understandably drawn the eye of observers of the evening sky for hundreds of thousands of years.
Sirius has many names. Astronomers realize over fifty designations for the megastar, however the most typically used is Alpha Canis Majoris, the brightest megastar within the constellation Canis significant. This isLatin for the 'Great Dog', which has ended in its renowned nickname the ‘Dog Star’. Over the centuries many ideals have become linked to Sirius. a few of these ideals nonetheless echo in such words as ‘the puppy days of summer’, which the traditional Romans understood good. different previous ideals some time past fell from public realization — merely to be revived and to develop into sleek well known and clinical controversies. even though those ideals could appear particularly fresh, many have their origins within the old lore surrounding Sirius; people appear clearly attracted to its brilliance, and a shocking variety of glossy cults have nucleated round ideals during which Sirius performs a well-known function.

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Additional resources for Astronomy - Sirius - Brightest Diamond in the Night Sky

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He mentions the "color" of only six stars. Five, such as Betelgeuse and Arcturus, are correctly described as "reddish". Curiously, Sirius is among the "reddish" stars: The star is, on the mouth, brightest, called the "Dog" and reddish. Given that Sirius is not red at all, but a distinct bluewhite star, this curious description has inspired a seemingly endless debate as to why Ptolemy used the term reddish in connection with Sirius (see Chapter 10). It is unclear how much of Ptolemy's star catalog consisted of observations he had made himself and how much represented borrowed updates from earlier catalogs such as that of Hipparchus.

When Sirius rises with the sun trees can no longer outwit it by feebly putting forth leaves. For with its keen shafts it easily pierces their ranks, and strengthens some but destroys all the growth of others. We also hear of it at its setting. The other stars lying around about Sirius define the legs more faintly. Under the two feet of Orion the Hare is hunted constantly all the time: Sirius moves forever behind it as if in pursuit, rises after it and watches it as it sets. Aratus here refers to the fact that as the constellation Canis Major rises in the eastern sky, below and to the left of Orion, at first only Sirius, among the stars of Canis Major, is visible near the horizon.

In order to accommodate the obvious nonuniform and noncircular motions of the planets, it was therefore necessary to postulate a set of multiple compound circular motions for each planet. Ptolemy, building on older Greek ideas, first had each planet circle the earth on a large circle called a deferent. Attached to each deferent was a smaller circle called an epicycle, which rotated as it traveled around the deferent. Ptolemy's critical addition to this scheme was to offset the center of each deferent from the earth.

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