A Dictionary of Astronomy by Ian Ridpath PDF

By Ian Ridpath

ISBN-10: 0192115960

ISBN-13: 9780192115966

Astronomy is increasing virtually as speedily because the universe itself, and the proliferating clinical jargon can occasionally baffle even the main committed novice. Now, in a few 4,000 concise, up to date entries, this dictionary cuts a transparent course in the course of the maze of complicated technical language, delivering complete, transparent definitions drawn from all points of astronomy. Compiled by means of Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional staff of participants, A Dictionary of Astronomy comprises the latest entries from astrophysics and cosmology to galaxies and time.
listed below are succinct definitions for the massive Bang thought, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, house missions, and lately named sunlight process gadgets exhibit how astronomers have explored the universe. The Dictionary additionally offers biographical entries on eminent astronomers from Copernicus to Edwin Hubble.
From black gap to white dwarf, and from spiral galaxies to sunlight waves, A Dictionary of Astronomy opens a window at the universe for beginner astronomers far and wide.

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Albedo The fraction of the total light or other radiation falling on a non-luminous body, such as a planet, or on a planetary surface feature, that is reflected from it. In general, the albedo is equal to the amount of light reflected divided by the amount of light received. 0 (100%) for a perfect reflector. Planets or planetary satellites with dense atmospheres have much higher albedos than those with transparent or no atmospheres. The albedo may vary over the surface, so for practical purposes an average albedo is specified.

It consists of a bar pivoted so as to swing in a vertical plane and be aligned with a celestial object. The object's altitude can then be read off from a scale. Alidades were often incorporated in ancient position-measuring instruments, such as *astrolabes. Alioth The star Epsilon Ursae Majoris. 8 with strong lines of chromium in its spectrum. 1 days. y. away. Alkaid The star Eta Ursae Majoris, also known as Benetnasch. y. away. Allegheny Observatory The observatory of the University of Pittsburgh, at an altitude of 380 m in Pittsburgh, Pennsylvania, founded in 1860 but relocated on its present site, Riverview Park, in 1912.

Html (1 of 2) [9/29/2007 7:47:12 PM] Document altazimuth mounting A method of mounting a telescope so that it can pivot up and down (in altitude) around one axis and horizontally (in azimuth) around the other axis. Following an object across the sky thus usually requires simultaneous movements around each axis. Moreover, as objects cross the sky their orientation in the field of view changes. The *equatorial mounting was therefore long preferred for large telescopes, but with the advent of readily available computer control, which can easily compensate for the varying movements and field rotation, the altazimuth mounting has been adopted for large telescopes as it simplifies construction.

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