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Holiday
Any day fixed by law, custom or religion on which day-to-day business is suspended for the celebration or commemmoration of some event or public figure.
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artificial satellite
Astronomy; General astronomy
a satellite made by humans which is gravitationaly bound and in orbit of a larger physical object
ascending node
Astronomy; General astronomy
In the orbit of a solar-system body, the point where the body crosses the ecliptic from south to north: for a star, out of the plane of the sky toward the observer.
aspheric
Astronomy; General astronomy
An optical surface with departures in shape from a perfect sphere in order to cancel optical imperfections or aberrations.
association
Astronomy; General astronomy
A sparsely populated grouping (mass range 102-103 Msun) of very young, massive stars lying along a spiral arm of the Milky Way, whose spectral types or motions in the sky indicate ...
asterism
Astronomy; General astronomy
a group of bright stars which form a conspicuous pattern on the celestial sphere
asteroid (minor planet, planetoid)
Astronomy; General astronomy
Also called planetoids or minor planets, the asteroids are tiny planets most of which orbit the Sun between Mars and Jupiter. The largest - and the first discovered - is Ceres, ...
