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, up to date entries, this dictionary cuts a transparent course in the course of the maze of advanced technical language, delivering complete, transparent definitions drawn from all features of astronomy. Compiled by way of Ian Ridpath, a fellow of the Royal Astronomical Society, and knowledgeable workforce of individuals, 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, area missions, and lately named sunlight process gadgets express 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 sunlight waves, A Dictionary of Astronomy opens a window at the universe for newbie astronomers in every single place.
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Extra info for A Dictionary of Astronomy (Oxford Paperback Reference)
Examples of aplanatic systems include some types of achromatic lens and the *Ritchey-Chrétien telescope. apoapsis The point in an elliptical orbit that lies farthest from the centre of the object being orbited. html (1 of 2) [9/29/2007 7:47:18 PM] Document apocentre The point in an elliptical orbit that lies farthest from the centre of mass of the orbiting system, such as a binary star or a planet and satellite. html (2 of 2) [9/29/2007 7:47:18 PM] Document Page 23 apochromatic Describing a lens or optical system with very little *chromatic aberration.
Html (1 of 2) [9/29/2007 7:47:20 PM] Document Arecibo Observatory The site of the world's largest radio astronomy dish, 305 m in diameter, opened in 1963 and upgraded in 1974 when the original wire-mesh surface was replaced by solid panels. The observatory is situated 12 km south of Arecibo, Puerto Rico, and is operated by the National Astronomy and Ionosphere Center (NAIC), which has its headquarters at Cornell University, New York State. The dish is suspended in a natural hollow in the ground, and scans a strip of sky overhead as the Earth rotates.
He noted that the dark *Fraunhofer lines in the Sun's spectrum had the appearance of a reversed emission spectrum. In 1861 he began an intensive study of the solar spectrum, confirming the presence of hydrogen in the Sun. In 1868 he published an atlas of the solar spectrum and measurements of the wavelengths of over a thousand spectral lines. These measurements were expressed in units of 10-7 mm, subsequently named the angstrom unit in his honour. angstrom (symbol Å) A unit of length equal to 10-10 m.