By Ian Ridpath
Astronomy is increasing virtually as speedily 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 direction throughout the maze of complicated technical language, delivering complete, transparent definitions drawn from all features of astronomy. Compiled by means of Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional crew of individuals, A Dictionary of Astronomy comprises the newest entries from astrophysics and cosmology to galaxies and time.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 express 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 all over the place.
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Additional info for Dictionary of Astrononmy (1998)(1st ed.)(en)(532s)
4. y. away. 7 AU from the Sun, with inclinations of 11–12°. The family is unusual in that its members are of varying composition (classes C, G, and T). The family is named after the C-class (54) Alexandra, 176 km in diameter, discovered in 1858 by the German astronomer Hermann Mayer Salomon Goldschmidt (1802–66). 8. ALEXIS A small US Department of Defense satellite carrying four telescopes to map the soft X-ray and extreme ultraviolet background over the whole sky. ALEXIS (Array of Low-Energy X-ray Imaging Sensors) was launched in 1993 April.
See DEGREE OF ARC; MINUTE OF ARC; SECOND OF ARC; RADIAN. archaeoastronomy The study of the astronomical significance of archaeological remains and artefacts, particularly large stone structures (megaliths). Structures such as Stonehenge in England and the Great Pyramid in Egypt have components which are oriented to align with the positions of celestial bodies at significant times of the year. This suggests that they were constructed at least partly for astronomical purposes, although further interpretation remains speculative.
Alpha2 Canum Venaticorum star A type of main-sequence, extrinsic variable star; abbr. ACV. , accompanied by changes in the strengths of the spectral lines and the magnetic fields. 5 days to more than 160 days. The spectra (B8p-A7p) exhibit abnormally strong lines of silicon, strontium, chromium, and rareearth elements. ) variations superimposed on the fluctuations caused by the rotation. Alphecca The star Alpha Coronae Borealis, also spelt Alphekka and also known as Gemma. 4 days. The two stars are dwarfs of spectral types A0 and G5.