By Jean Meeus
Acknowledged in book," nearly each prior instruction manual on celestial calcuations used to be pressured to depend on formaulae for solar Moon and planets that have been built within the final century or ahead of 1920. along with his particular knack for computations of all kinds, the writer has made the fundamental of those glossy options on hand to us all.
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It is) the Star of piercing brightness. In Africa, the Dogon tribe, in the modern nation of Mali, is claimed to possess a well-publicized and remarkable set of beliefs concerning Sirius. These beliefs and their possible origin are discussed in more detail in Chapter 11. In addition to these beliefs, the Dogon are said to have noted the heliacal rising of Sirius by the use of stone markers which they used to define the sight lines on the horizon to the points where Sirius will rise just before the sun.
A late Christian addition to this heavenly construct was a region of celestial light and the abode of god and the angels, known as the Empyrean. It was the Empyrean where the "music of the spheres" was believed to be generated and where Dante was led by Beatrice in the Divine Comedy. The working details of this universe were a matter of debate and speculation. Was the number of stars countless, or simply the 1022 catalogued by Ptolemy? Were the stars self-luminous or did they reflect the light from the sun?
The sudden appearance of this star, followed by its slow fading, convinced Tycho that the old Ptolemaic universe was false and that the ethereal realms of Aristotle and Ptolemy were not unchangeable. It was also this new star that thrust Tycho into a lifelong career as an astronomer. He later went on to construct a well-staffed private observatory on the tiny island of Hven in the strait between Denmark and Sweden. There for the next twenty years he made the most precise observations of the positions of the planets and the stars, in the era before the invention of the telescope.
Astronomical algorithms by Jean Meeus