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

By Jay B. Holberg

ISBN-10: 038748941X

ISBN-13: 9780387489414

Of all of the mounted stars within the evening sky, Sirius is by means of some distance the brightest – nearly two times as vivid as its nearest rival, the celebrity Canopus, which lies too a long way south to be considered from many of the Northern Hemisphere. basically the sunlight, Moon and the planets Venus, Jupiter and, now and then, Mars, look brighter. Sirius, with its flashing brilliance, is a awesome function of the northern iciness sky and has understandably drawn the eye of observers of the evening sky for millions of years.
Sirius has many names. Astronomers realize over fifty designations for the famous person, however the most ordinarily used is Alpha Canis Majoris, the brightest celebrity 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 emerge as 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 awareness — merely to be revived and to develop into sleek renowned and clinical controversies. even though those ideals could appear fairly fresh, many have their origins within the old lore surrounding Sirius; people look clearly attracted to its brilliance, and a shocking variety of glossy cults have nucleated round ideals during which Sirius performs a well-liked position.

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

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Bradley Schaefer of the University of Louisiana, at Baton Rouge, carefully measured the locations of the constellations relative to the latitudinal and meridional lines on the globe. 1. An imagined likeness of Claudius Ptolemy {Great Astronomers, R. S. Ball, 1907). the island of Rhodes, which lies about 5° of latitude north of Alexandria. Hipparchus is known to have worked at Rhodes, and it is Schaefer's conclusion that the stellar positions used to fashion the globe were taken from Hipparchus' lost star catalog.

In this geocentric model, the sun and the moon orbited the earth but all the other planets orbited the sun. The stars remained in a distant far off shell. One of the motivations for Tycho's observations was to gather precise measurements of the positions of the planets, in support of his "Tychonic System". A necessary prerequisite for accurate planetary measurements was a precise star catalog. What finally emerged in 1598 was a catalog of some 1004 stars, all measured visually, with an unheard-of level of precision of nearly one arc minute.

At the center of this finite and spherical universe, rested the immobile earth, where the four elements— earth, water, air, and fire—were in constant flux. Upon the earth and up to the level of the first celestial sphere, defined by the moon, change was dominant and pervasive. Birth, growth, death, and decay proceeded as they always had. Heavy base material, such as stones, fell towards the center of the earth and light ethereal bodies, such as flames, ascended. Beyond the sphere of the moon lay an entirely different realm.

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


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