Celestial Shadows

Celestial Shadows

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Much of what is known about the universe came from the study of celestial shadows. This book looks in detail at the way eclipses and other celestial shadows have given us amazing insights into the nature of the objects in our solar system and how they are even helping us discover and analyze planets that orbit stars other than our Sun. A variety of eclipses, transits, and occultations of the mooons of Jupiter and Saturn, Pluto and its satellite Charon, asteroids and stars have helped astronomers to work out their dimensions, structures, and shapes - even the existence of atmospheres and structures of exoplanets. Long before Columbus set out to reach the Far East by sailing West, the curved shadow of the Earth on the Moon during a lunar eclipse revealed that we inhabit a round world, a globe. More recently, comparisons of the sunlit and Earthlit parts of the Moon have been used to determine changes in the Earth's brightness as a way of monitoring possible effects in cloud coverage which may be related to global warming. Shadows were used by the Greek mathematician Eratosthenes to work out the first estimate of the circumference of the Earth, by Galileo to measure the heights of the lunar mountains and by eighteenth century astronomers to determine the scale of the Solar System itself. Some of the rarest and most wonderful shadows of all are those cast onto Earth by the lovely qEvening Starq Venus as it goes between the Earth and the Sun. These majestic transits of Venus occur at most two in a century; after the 2012 transit, there is not a chance to observe this phenomenon until 2117, while the more common sweep of a total solar eclipse creates one of the most dramatic and awe-inspiring events of nature. Though it may have once been a source of consternation or dread, solar eclipses now lead thousands of amateur astronomers and qeclipse-chasersq to travel the globe in order to experience the dramatic view under qtotality.q These phenomena are among the most spectacular available to observers and are given their full due in Westfall and Sheehan's comprehensive study.Foucault L (1862) DActermination expAcrimentale de la vitesse de la lumiAure; description des appareils. ... Bull Am Astron Soc 9:451 French RG, Nicholson PD, Cooke ML et al (1993) Geometry of the Saturn system from the 3 July 1989 occultation of ... Reductionist Publications, Hereford, AZ, d/b/a. pdf version. http:// brucegary.net/book_EOA/x.htm Gassendi P (1632) Mercurius in sole visa et Venus invisa.

Title:Celestial Shadows
Author:John Westfall, William Sheehan
Publisher:Springer - 2014-11-19


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