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

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  • 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.

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  • Angular gyrus

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