Hour Angle
The angular distance of a celestial object measured westward along the celestial equator from the zenith crossing. In effect, HA ...
The angular distance of a celestial object measured westward along the celestial equator from the zenith crossing. In effect, HA ...
The law of physics that states that the farther a galaxy is from us, the faster it is moving away ...
An element consisting of one electron and one proton. Hydrogen is the lightest of the elements and is the building ...
A state that occurs when compression due to gravity is balanced by a pressure gradient which creates a pressure gradient ...
A system consisting of a spiral galaxy surrounded by several dwarf white galaxies, often ellipticals. Our galaxy and the Andromeda ...
A term used to describe water or a number of gases such as methane or ammonia when in a solid ...
International Celestial Reference Frame. The realization of the ICRS provided by the adopted positions of extragalactic objects.
International Celestial Reference System. Conceptual basis for celestial positions, aligned with respect to extremely distant objects and utilizing the theory ...
A measure of the tilt of a planet's orbital plane in relation to that of the Earth.
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