Get A History of Astronomy from Thales to Kepler (2nd Edition) PDF

By J. L. E. Dreyer

A masterpiece of ancient perception and medical accuracy, this is often the definitive paintings on Greek astronomy and the Copernican Revolution. starting with the traditional Egyptians, it levels from the Pythagoreans and Plato to medieval ecu and Islamic cosmologies, concluding with detailed surveys of the works of Copernicus, Brahe, and Kepler.

Formerly titled: background of the Planetary structures from Thales to Kepler

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Extra info for A History of Astronomy from Thales to Kepler (2nd Edition) (Dover Books on Astronomy)

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If they were right and Chiron was a comet, it was a big one; its brightness suggested that it was about fifteen times bigger than the nucleus of Halley’s comet. A few more details of the nature of Chiron were revealed a decade later when David Tholen of the University of Hawaii, amongst others, showed that Chiron was brightening faster than expected as it approached the Sun. Like planets, asteroids do not shine by themselves, they merely reflect sunlight and their brightness at any given time depends on a number of factors.

The fact that some, indeed an increasing number of them, are being detected means that the Centaur population is being continuously replenished. The discovery of the Centaurs lent credence to increasingly detailed suggestions that there was a reservoir of objects beyond Neptune that could be diverted into Centaur-like orbits and which would then evolve inwards to become short-period comets. 38 CHAPTER 3 The mystery of the shortperiod comets By the early 1970s the rate at which short-period comets were being discovered was increasing suspicions that there were too many to be explained by objects captured directly from the Oort Cloud.

A number of other Centaurs have since been discovered, but many of them are very faint and not much is known about them. The best observed are 7066 Nessus (1993 HA2), 8504 Asbolus (1995 GO) and 10199 Chariklo (1997 CU26), all of which were discovered by the Spacewatch team. Chariklo is quite bright and photometry of this object shows that it is redder than Chiron, but less red than Pholus. 25 micron feature seen on Pholus. Paradoxically, ice is not seen in most published spectra of 8504 Asbolus,‡ which looks otherwise rather similar to Chariklo.

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