By Ian Ridpath
Astronomy is increasing virtually as swiftly because the universe itself, and the proliferating clinical jargon can occasionally baffle even the main devoted novice. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent direction during 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 workforce of participants, A Dictionary of Astronomy comprises the latest entries from astrophysics and cosmology to galaxies and time.Here are succinct definitions for the massive Bang idea, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, house missions, and lately named sun procedure gadgets convey 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 newbie astronomers far and wide.
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Extra info for Dictionary of Astrononmy (1998)(1st ed.)(en)(532s)
27, the third-brightest in the sky. y. y. farther than Proxima Centauri. Alpha Crucis The brightest star in the constellation Crux, also called Acrux. 7. 8. y. distant. Alpha Cygnid meteors A meteor shower with ill-defined activity limits, emanating throughout July and August from an apparently stationary radiant at RA 21h 00m, dec. +48° near Deneb. Observed rates seldom exceed 1–3 meteors/h, and there are doubts as to the shower's authenticity. html (1 of 2) [9/29/2007 7:47:11 PM] Document Alpha Cygni star A type of supergiant pulsating variable star exhibiting *non-radial pulsation; abbr.
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.
Angular acceleration The rate of change in the *angular velocity of a spinning body, or in the angular velocity of a celestial object in its orbit about another body. angular diameter The apparent size of an object, such as the diameter of a planet, expressed in degrees, minutes, or seconds of arc. angular distance See ANGULAR SEPARATION. angular momentum The momentum a body has by virtue of its rotation. A body such as a planet has two types of angular momentum: one type results from its motion in orbit around the Sun, and the other from its spin on its own axis.
Dictionary of Astrononmy (1998)(1st ed.)(en)(532s) by Ian Ridpath