angular diameter

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angular diameter

See apparent diameter.

angular diameter

[′an·gyə·lər ‚dī′am·əd·ər]
(astronomy)
The angle subtended at the observer by a diameter of a distant spherical body which is perpendicular to the line between the observer and the center of the body.
References in periodicals archive ?
The Indian astronomical hypotheses defined the luminaries' angular diameters as a single variable function of their instantaneous velocity (i.
Annular eclipses and considerations about solar and lunar angular diameters in Medieval astronomy', in Orchiston W.
100-170 AD) determined the apparent angular diameter of the Moon to be equal to or larger than that of the Sun, which he considered to be constant.

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