By Ian Ridpath
Astronomy is increasing virtually as speedily because the universe itself, and the proliferating medical jargon can occasionally baffle even the main devoted beginner. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent course in the course of the maze of advanced technical language, delivering complete, transparent definitions drawn from all points of astronomy. Compiled by way of Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional crew of participants, A Dictionary of Astronomy comprises the latest entries from astrophysics and cosmology to galaxies and time.
listed here are succinct definitions for the large 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 sunlight approach gadgets 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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Alrescha The star Alpha Piscium, also spelt Alrischa. 2, with an orbital period of about 900 years. 8. Alshain The star Beta Aquilae. y. away. al-Sufi See under SUFI. 77, the twelfth-brightest star in the sky. y. away. Altair forms one corner of the so-called Summer Triangle of stars, completed by Deneb and Vega. html (1 of 2) [9/29/2007 7:47:12 PM] Document altazimuth mounting A method of mounting a telescope so that it can pivot up and down (in altitude) around one axis and horizontally (in azimuth) around the other axis.
However, this movement is not entirely uniform, and consequently apparent solar time can be anything up to a quarter of an hour ahead of or behind *mean solar time. The difference between apparent solar time and mean solar time is known as the *equation of time. 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.
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. ACYG. 1 mag. Multiple pulsation frequencies are superimposed, giving rise to light-curves that often appear highly irregular. The periods range from a few days to several weeks. html (2 of 2) [9/29/2007 7:47:11 PM] Document Page 13 alpha particle (a-particle) The nucleus of a helium-4 atom.
A Dictionary of Astronomy by Ian Ridpath