By Ian Ridpath
Astronomy is increasing nearly as speedily because the universe itself, and the proliferating medical jargon can occasionally baffle even the main committed novice. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent direction in the course of the maze of complicated technical language, supplying complete, transparent definitions drawn from all features of astronomy. Compiled through Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional crew of members, A Dictionary of Astronomy comprises the newest entries from astrophysics and cosmology to galaxies and time.
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, house missions, and lately named sunlight method gadgets express 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 sun waves, A Dictionary of Astronomy opens a window at the universe for beginner astronomers all over the place.
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Extra info for A Dictionary of Astronomy (Oxford Paperback Reference)
Sirius is an Am star. anaemic spiral galaxy A type of spiral galaxy with characteristics intermediate between normal gasrich spirals and gas-poor lenticular galaxies. They are seen most frequently in rich clusters of galaxies. Examples are NGC 4941 and 4866 in the Virgo Cluster, and NGC 4921 in the Coma Cluster. analemma A curve that depicts the changing altitude of the Sun during the year at noon, and also the difference between apparent solar time and mean solar time. The analemma is shaped like a thin figure of eight, its height corresponding to the Sun's altitude and its width to the time difference.
They are seen most frequently in rich clusters of galaxies. Examples are NGC 4941 and 4866 in the Virgo Cluster, and NGC 4921 in the Coma Cluster. analemma A curve that depicts the changing altitude of the Sun during the year at noon, and also the difference between apparent solar time and mean solar time. The analemma is shaped like a thin figure of eight, its height corresponding to the Sun's altitude and its width to the time difference. It was originally a refinement to sundials that allowed corrections to be made for the *equation of time.
All objects on an almucantar are at the same altitude at a given time. 7. y. away. 7, the middle star of the belt of Orion. y. away. Alnitak The star Zeta Orionis, one of the three stars of the belt of Orion. y. 2. a Symbol for *right ascension. Alpha Capricornid meteors A meteor shower of generally low activity (maximum ZHR 10) between July 15 and August 20. There appear to be several maxima, the principal one around August 2. Alpha Capricornid meteors are often long, slow, and bright. At maximum, the radiant lies at RA 20h 36m, dec.
A Dictionary of Astronomy (Oxford Paperback Reference) by Ian Ridpath