Iapetus (satellite) Dictionary of astronomy, letter J Saturn's eighth satellite in order of distance from the planet of the rings. Make a complete turn around Saturn in seventy-nine days and eight hours, at an average distance of 3,560,000 km. It has a diameter of about 1,500 km (less than half of the mole) and a mass a hundred times smaller than that of our natural satellite.
Aberration of light Dictionary of astronomy, letter A The Aberration of light is the phenomenon by which the position of the stars appears displaced with respect to the real one. This movement is the result of movements such as the rotation of the Earth, its orbital revolution around the Sun and the movement of the Solar System through space.
Optical aberration Astronomy dictionary, letter A The generic term optical aberration encompasses a series of defects that affect optical instruments with lenses and mirrors. In the chromatic aberration the different colors (wavelengths) that make up the light, when passing through a lens they are deflected in different ways and give rise to the formation of an image contoured by the colors of the rainbow.
Astronomy Glossary A glossary (from the Latin "glossarium") is a catalog of words from the same discipline or from the same field of study (in this case, astronomy and related fields), with definition or explanation of each of them. In principle, dictionaries should include them all; the glossaries ... too, or approach.
Azimuth (Azimut) Dictionary of astronomy, letter A Azimuth or azimuth comes from the Arabic "as-sumut", plural of "as-samt", means the address, the zenith. The azimuth is the angle that forms the vertical circle that passes through a point of the celestial sphere or the globe with the meridian. It is one of the two coordinates of the altacimuthal system or horizontal astronomical coordinate system.
Sulfuric acid Astronomy dictionary, letter A Sulfuric acid is a strong, oily, corrosive and heavy dibasic acid of formula H 2 SO 4 that is colorless in its pure state; is an oxidizing and dehydrating highly potent agent. Sulfuric acid is a corrosive product, high viscosity, colorless and with a relative density of 1.85.
Accretion Astronomy dictionary, letter A Accretion is the aggregation of matter to a body. For example, the accretion of mass by a star is the addition of mass to the star from interstellar matter or a companion. The accretion theory was proposed by Russian geophysicist Otto Schmidl in 1944.
Abundance of elements Astronomy dictionary, letter A Among the most important achievements of Astrophysics, the discovery that the chemical elements that make up the various celestial bodies and their relative abundance, are practically the same throughout the Universe, must be included. This result has been achieved both through indirect analysis of stars and distant galaxies with spectroscopy methods, as well as through direct chemical analysis of terrestrial rocks, meteorites and lunar rocks.
Interstellar absorption Astronomy dictionary, letter A Interstellar absorption is the phenomenon by which a star appears less luminous, due to its distance. This is caused by the presence, in interstellar space, of clouds formed by gases and dusts. Considering that these substances are uniformly distributed in space, in a path of about 3.
Astronomy Glossary: V It is curious that we can predict the path of the farthest stars with centuries in advance and, instead, we will not be able to know how the wind will blow tomorrow on our little planet. Heinrich Spoerl ABCDEFGHIJKLMNOPQRSTUVWXYZ Custom Search