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General astronomy
Industry: Astronomy
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General astronomy
3-kpc arm
Astronomy; General astronomy
A component of the Sagittarius arm with noncircular gas motions. It is seen in absorption against Sgr A with a velocity of -53 km s-1, implying that at least part of the arm is expanding away from ...
4-kpc arm
Astronomy; General astronomy
A component of the Sagittarius arm with noncircular gas motions.
anti-reflection coating
Astronomy; General astronomy
Also AR coating. A layer of material of lower refractive index of just the right thickness (1/4 wave) is deposited on the optical surface to be coated. More complex coatings are possible which cover ...
apastron
Astronomy; General astronomy
The point in the orbit of one component of a binary system where it is farthest from the other.
aphelion
Astronomy; General astronomy
The point in a planetary orbit that is at the greatest distance from the Sun.
aplanatic system
Astronomy; General astronomy
A system of three lenses which, taken together, correct for spherical aberration, chromatic aberration, and coma.
apocenter
Astronomy; General astronomy
The point in the orbit of one component of a binary system which is farthest from the center of mass of the system.
