Download A Dictionary of Astronomy by Ian Ridpath PDF

By Ian Ridpath

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, updated entries, this dictionary cuts a transparent course during the maze of complicated technical language, providing complete, transparent definitions drawn from all points of astronomy. Compiled by means of Ian Ridpath, a fellow of the Royal Astronomical Society, and knowledgeable group of individuals, A Dictionary of Astronomy comprises the newest entries from astrophysics and cosmology to galaxies and time.
listed here are succinct definitions for the massive Bang conception, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, area missions, and lately named sun method gadgets express how astronomers have explored the universe. The Dictionary additionally presents 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 in all places.

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It publishes the *Astronomical Journal, *Astrophysical Journal, and a quarterly Bulletin (BAAS). html (1 of 2) [9/29/2007 7:47:12 PM] Document Ames Research Center A NASA scientific and engineering establishment in Mountain View, California. It was founded in 1939 for aeronautical research and became part of NASA in 1958. As well as aeronautics, Ames specializes in space life sciences and various branches of astronomy including Solar System exploration and infrared astronomy. html (2 of 2) [9/29/2007 7:47:12 PM] Document Page 15 AM Herculis star A type of cataclysmic binary whose light exhibits linear and, more significantly, extremely strong circular *polarization (hence the alternative name polar); abbr.

Aldebaran The star Alpha Tauri. 1 mag. 85. y. away, about half the cluster's distance. 4. y. away. 7 AU from the Sun, with inclinations of 11–12°. The family is unusual in that its members are of varying composition (classes C, G, and T). The family is named after the C-class (54) Alexandra, 176 km in diameter, discovered in 1858 by the German astronomer Hermann Mayer Salomon Goldschmidt (1802–66). 8. ALEXIS A small US Department of Defense satellite carrying four telescopes to map the soft X-ray and extreme ultraviolet background over the whole sky.

Apparition The period of time during which an object in the Solar System is visible from Earth, such as an evening apparition of Venus or the apparition of a periodic comet. The term is not usually applied to objects that are more regularly visible, such as the Sun or stars. appulse The apparent close approach of two celestial bodies when one moves into the same line of sight as the other, such as when a planet appears to pass another planet or a star. apse, apsis See APSIDES. e. the line of apsides) of an orbit; also known as *advance of perihelion.

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