Download A Dictionary of Astronomy (Oxford Paperback Reference) by Ian Ridpath PDF

By Ian Ridpath

Astronomy is increasing nearly as swiftly because the universe itself, and the proliferating medical jargon can occasionally baffle even the main committed beginner. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent direction throughout the maze of advanced technical language, providing complete, transparent definitions drawn from all elements of astronomy. Compiled by way of Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional workforce of members, A Dictionary of Astronomy includes the latest 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, house missions, and lately named sunlight procedure gadgets exhibit 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 sun waves, A Dictionary of Astronomy opens a window at the universe for beginner astronomers all over.

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It is actually a triple system, consisting of a bright binary with a period of 80 years and a faint red dwarf 2° away called *Proxima Centauri. 3. 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.

The Arecibo dish is used for atmospheric studies as well as astronomy. Arend-Roland, Comet (C/1956 R1) A long-period comet discovered in 1956 November by the Belgian astronomers Silvain Arend (1902–92) and Georges Roland (1922–91); formerly designated 1957 III. 32 AU, on 1957 April 8. 57 AU, was on April 21. At peak brightness, the comet reached magnitude -1, with a tail of 25–30°. It also had a prominent *antitail. 9. areo- Prefix referring to Mars; for example, areography is the study of the surface of Mars.

Double stars are often referred to by their ADS number as listed in Aitken's catalogue. 2 mag. or more) and somewhat higher luminosity. The AI Velorum stars may be the older of the two groups. They are sometimes referred to as dwarf Cepheids. AJ Abbr. for *Astronomical Journal. al- For personal names beginning 'al-', see under the next element of the name. Albategnius Latinized name of al-*Battani. al-Battani See under BATTANI. 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.

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