Download Cometography: Volume 1, Ancient-1799: A Catalog of Comets by Gary W. Kronk PDF

By Gary W. Kronk

Cometography is a catalog of each comet saw all through heritage. it's the such a lot whole and finished choice of information on comets to be had. Cometography is available in 4 self-contained sequential volumes and this, the 1st, covers precedent days via to the top of the eighteenth century. Cometography presents the entire key parameters of every good saw comet in addition to non-technical information on how a comet can have encouraged a number of cultures on the time of its visual appeal. in lots of situations, dates of vital old occasions may be corrected in response to the looks of a comet and pointed out utilizing this publication. it will likely be priceless to historians of technological know-how in addition to delivering novice astronomers with a definitive reference on comets in the course of the a long time.

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Although Aristotle held that the Earth was located at the centre of the universe, this was in a geometrical sense only. Contrary to the Pythagoreans, he saw no reason to identify the geometric centre with the true or ‘natural’ centre of the universe, understood in a physical and ontological sense. On the contrary, in De caelo he suggested that this more elevated status belonged to the sphere of the fixed stars, from where motion was transmitted to the interior parts of the world. That which contains is more precious than that which is contained, he wrote.

Heaven has two gates, east and west, for the Sun issues from one and retires into the other. . 53 The Venerable Bede, an English monk living a generation after Isidore, had an impressive mastery of conventional learning. He wrote a work on calendars which enjoyed a high reputation throughout the Middle Ages, and he was also the author of a cosmological treatise, again titled De natura rerum, which to a large degree relied on Pliny. Contrary to some of his predecessors, Bede had no problem with the spherical Earth, and he stated that the Sun was much larger than the Earth (he still stuck to the idea of water above the heaven).

Contrary to most other authors, he drew a sharp distinction between astronomy and astrology, rejecting prognostic astrology as superstition. In a smaller work, De natura rerum, Isidore compiled contemporary knowledge of the Earth and heaven. His Earth was a flat disc, and outside the firmament he assumed a watery heaven in accordance with Genesis. ‘The sphere of heaven is a certain form, spherical in shape,’ he wrote: Its center is the Earth and it is shut in equally on all sides. They say that the sphere has neither beginning nor end; since it is round like a circle its beginning and end cannot readily be seen.

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