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General astronomy
Industry: Astronomy
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General astronomy
argon (Ar, 1S0 in ground state)
Astronomy; General astronomy
colourless, odourless gas comprising 1% of the atmosphere
argument of the perihelion (ω, longitude of the perihelion)
Astronomy; General astronomy
Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.
array telescope
Astronomy; General astronomy
a telescope composed of an array of separete individual elements acting in concert
arsenic (As, 4S3/2 in ground state)
Astronomy; General astronomy
a metalloid element with two main forms, grey α arsenic and β arsenic
