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 clinical jargon can occasionally baffle even the main committed beginner. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent direction during the maze of advanced technical language, providing complete, transparent definitions drawn from all elements of astronomy. Compiled through Ian Ridpath, a fellow of the Royal Astronomical Society, and knowledgeable 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 large Bang idea, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, house missions, and lately named sun method 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 resources for A Dictionary of Astronomy (Oxford Paperback Reference)

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Annual aberration was discovered by J. *Bradley in 1728 from observations of the changes in distance from the zenith of the star Gamma Draconis. 5. This is the maximum amount by which a star can appear to be displaced from its mean position. During the course of a year, the star appears to move around its mean position in a shape that ranges from a circle for a star at the ecliptic pole, via a progressively flattened ellipse, to a straight line for a star on the ecliptic. See also ETERMS. annual equation A periodic disturbance in the celestial longitude of the Moon, resulting from the changing gravitational pull of the Sun around the Earth's elliptical orbit; also known as annual inequality.

J. Ångström. angular acceleration The rate of change in the *angular velocity of a spinning body, or in the angular velocity of a celestial object in its orbit about another body. angular diameter The apparent size of an object, such as the diameter of a planet, expressed in degrees, minutes, or seconds of arc. angular distance See ANGULAR SEPARATION. angular momentum The momentum a body has by virtue of its rotation. A body such as a planet has two types of angular momentum: one type results from its motion in orbit around the Sun, and the other from its spin on its own axis.

See also RESOLVING POWER. angular separation The apparent distance between two objects, such as two stars, expressed in degrees, minutes, or seconds of arc. angular velocity (symbol ω) The rate of rotation of a body, either about its own axis or in its orbit about another body. For example, the Earth rotates with a certain angular velocity about its polar axis, but it also has angular velocity in its revolution about the Sun. html (1 of 2) [9/29/2007 7:47:14 PM] Document anisotropy A characteristic of a substance or body in which physical properties are different in different directions.

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