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- Number of terms: 3726
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1) Divination using the positions of the planets, the Sun and the Moon as seen against the stars in the constellations of the zodiac - a "science" almost as old as homo sapiens. Although at one stage in history astrology and astronomy were almost synonymous- the latter has advanced so far during the last three centuries that the two now bear little relation to each other. 2) The belief that human affairs and people's personalities and characters are influenced by (or encoded in) the positions of the planets.
Industry:Astronomy
The branch of astronomy that deals with measuring the positions of celestial objects, especially stars. Astrometrists measure parallaxes and proper motions, which allow astronomers to determine the distances and velocities of the stars.
Industry:Astronomy
The science that studies the physics and chemistry of extraterrestrial objects. The alliance of physics and astronomy, which began with the advent of spectroscopy, made it possible to investigate what celestial objects are and not just where they are.
Industry:Astronomy
Mantle of gases round a star planet or moon, sometimes even forming the apparent surface of the body. For a body to retain an atmosphere depends on the body's gravity, and the temperature and composition of the gases. Mean atmospheric pressure at the surface is 10330 kg/m2, and is also referred to as atmosphere.
Industry:Astronomy
The falling off of the energy density of radiation with distance from the source, or with passage through an absorbing or scattering medium.
Industry:Astronomy
the light produced by excited atoms and ions in the upper atmosphere of a planet
Industry:Astronomy
A phenomenon occurring when a discrete double-excitation state of an atom lies in the ground-state continuum. In the autoionization process one of the excited electrons is ejected, leaving the ion in an excited state (see dielectronic recombination; see also Auger effect). (also called pre-ionization.)
Industry:Astronomy
Theoretical straight line through a celestial body, around which it rotates.
Industry:Astronomy
