Read e-book online A Dictionary of Astronomy PDF

By Ian Ridpath

ISBN-10: 0192115960

ISBN-13: 9780192115966

Astronomy is increasing nearly as quickly because the universe itself, and the proliferating medical jargon can occasionally baffle even the main committed novice. 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 features of astronomy. Compiled by way of Ian Ridpath, a fellow of the Royal Astronomical Society, and knowledgeable staff of participants, A Dictionary of Astronomy includes the newest entries from astrophysics and cosmology to galaxies and time.
listed here are succinct definitions for the massive Bang thought, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, house 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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Herschel's calculated position of the Sun's *apex. His main achievement, begun in 1852, was a survey of all stars down to 9th magnitude in the northern hemisphere. The resulting star atlas and catalogue were published in 1859–62 as the *Bonner Durchmusterung. He subsequently initiated the first *AGK catalogue. Argelander also introduced the subdivision of magnitudes into tenths, the step method for estimating stellar magnitudes, and the practice of assigning capital roman letters to variable stars.

4 with an orbital period of about 900 years. The name Antares is Greek, and is usually translated as 'rival of Mars', because of its strong red colour, but sometimes as 'like Mars'. antenna A device used in radio astronomy to detect radio waves; also known as an aerial. In an antenna, radio waves induce an oscillating electric current in a conductor. The simplest antenna is a *dipole antenna, which is a simple metal rod. More complex antennas, such as the *Yagi antenna, may consist of one or more dipoles (the driven element) and other conductors (parasitic elements) which direct or reflect the waves on to the dipole and so increase the antenna's *directivity and *gain.

Y. away. 7, the middle star of the belt of Orion. y. away. Alnitak The star Zeta Orionis, one of the three stars of the belt of Orion. y. 2. a Symbol for *right ascension. Alpha Capricornid meteors A meteor shower of generally low activity (maximum ZHR 10) between July 15 and August 20. There appear to be several maxima, the principal one around August 2. Alpha Capricornid meteors are often long, slow, and bright. At maximum, the radiant lies at RA 20h 36m, dec. -10°. Alpha Centauri The closest star to the Sun, also known as Rigil Kentaurus.

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A Dictionary of Astronomy by Ian Ridpath

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