Download Cambridge Illustrated Dictionary of Astronomy by Jacqueline Mitton PDF

By Jacqueline Mitton

ISBN-10: 0521823641

ISBN-13: 9780521823647

This lavishly illustrated new dictionary written via an skilled author and advisor on astronomy offers a necessary consultant to the universe for beginner astronomers of every age. round 1300 conscientiously chosen and cross-referenced entries are complemented by way of hundreds and hundreds of gorgeous color illustrations, taken from house missions, the Hubble area Telescope, and different significant observatories on the earth and in area. exclusive stellar illustrator Wil Tirion has drawn 20 new superstar maps particularly for inclusion the following. A myriad of named astronomical items, constellations, observatories and house missions are defined intimately, in addition to biographical sketches for 70 of the main luminous contributors within the background of astronomy and area technological know-how. Acronyms and expert phrases are truly defined, making for the main thorough and thoroughly assembled reference source that academics and fans of astronomy will ever want.

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Various engraved scales enable the user to display the positions of the stars and the Sun for any time and date, though any particular astrolabe is only useful within a narrow range of latitudes. Astrolabes were often fitted with a sight on a movable arm so that they could be used to estimate the ä altitudes of stars. astrology An ancient tradition that claims to connect human traits and the course of events with the positions of the Sun, Moon and planets in relation to the stars. Before the seventeenth century, there was less of a clear distinction between astrology and the science of astronomy; many scientifically useful astronomical observations were originally made for astrological purposes.

Because of the effects of ä precession, the positions of the poles are not stationary but sweep out circles with radii of about 23 over a period of 25 800 years. celestial sphere The sky regarded as the inside of a distant hollow sphere. Though astronomical objects such as stars and planets really move through threedimensional space, the idea of the celestial sphere is very useful for describing their positions and motion as seen from a particular location, such as Earth’s surface. Every observer is located at the center of their own celestial sphere.

He then moved to ä Lick Observatory and in 1896 became Professor at Chicago. There he was able to use the newly built ä Yerkes Observatory. In 1892, he discovered Amalthea, the first moon of Jupiter to be found since Galileo discovered the four largest in 1610. His many other discoveries included 16 comets and ä Barnard’s star. He also realized that dark patches in the Milky Way are not due to the absence of stars but are dark nebulae hiding the stars behind them and he drew up a catalog of about 200 of them.

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