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# Angular diameter

the angle that the apparent diameter of a celestial object subtends at the eye of the observer.
Historical Examples

Its angular diameter at mean distance is 31′ 5″, or, say, just over ½°.
The Story of the Solar System George F. Chambers

The constant, 220, is the reciprocal of the quotient of the angular diameter of the moon divided by 2.
A Quantitative Study of the Nocturnal Migration of Birds. George H. Lowery.

It appeared about fifteen degrees in angular diameter, showing that we had travelled some thirty thousand miles from it.
To Mars via The Moon Mark Wicks

Tagged:

• Angular displacement

the amount of rotation of a point, line, or body in a specified direction about an axis. Historical Examples There may be an angular displacement—for example, in greenstick fracture. Manual of Surgery Volume Second: Extremities–Head–Neck. Sixth Edition. Alexander Miles It is common to find an angular displacement of both bones to the radial or to […]

• Angolan

a republic in SW Africa: formerly an overseas province of Portugal; gained independence Nov. 11, 1975. 481,226 sq. mi. (1,246,375 sq. km). Capital: Luanda. Contemporary Examples Some 15,000 Cuban troops fought in the angolan civil war of the 1980s. Raúl Castro Honors Mandela, but Ignores His Message Alex Massie December 9, 2013 adjective of or […]

• Angular dispersion

a measure of the angular separation of light rays of different wavelength or color traversing a prism or diffraction grating, equal to the rate of change of the angle of deviation with respect to the change in wavelength.

• Angular frequency

a measure of the frequency of an object varying sinusoidally equal to 2π times the frequency in cycles per second and expressed in radians per second. Symbol: π. noun (physics) the frequency of a periodic process, wave system, etc, expressed in radians per second

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