By Ian Ridpath
Astronomy is increasing nearly as swiftly 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 direction throughout the maze of advanced technical language, delivering complete, transparent definitions drawn from all facets of astronomy. Compiled by way of Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional group of participants, A Dictionary of Astronomy comprises the newest entries from astrophysics and cosmology to galaxies and time.
Here are succinct definitions for the massive Bang concept, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, area missions, and lately named sunlight approach items 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 newbie astronomers in every single place.
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Additional resources for A Dictionary of Astronomy (Oxford Paperback Reference)
The secondary minimum may be invisible. 2 to 10 000 days, and the amplitudes may reach several magnitudes. html (2 of 2) [9/29/2007 7:47:09 PM] Document Page 11 material is accreted directly on to the hot star, not via an *accretion disk. Mass transfer via an accretion disk does occur in the W Serpentis stars, which have wider separations and may be pre-Algol stars. The terms W Serpentis star and Serpentid are sometimes used to include both groups of stars. 7-m antenna originally opened in 1966.
Anomaly An angle that describes a body's position at a given time in an elliptical orbit. html (2 of 2) [9/29/2007 7:47:15 PM] Document Page 19 *true anomaly. e. its closest point to the object it orbits). anorthosite A medium- to coarse-grained igneous rock, grey to white in colour. It is composed almost entirely of calcium-rich plagioclase feldspar (95%), one of the most common rock-forming minerals, together with minor amounts of pyroxene (4%), olivine, and iron oxides. Anorthosite is thought to comprise a significant fraction of the lunar crust, and is present at all the Apollo and Luna landing sites.
Almanac A publication, usually issued yearly, listing predicted dates and times of forthcoming celestial phenomena and positions of celestial objects, along with other information of interest to astronomers, navigators, and surveyors. Examples are The *Astronomical Almanac and The *Nautical Almanac. almucantar A small circle on the celestial sphere that is parallel to the horizon. 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.
A Dictionary of Astronomy (Oxford Paperback Reference) by Ian Ridpath