apparent diameter

apparent diameter

(angular diameter) The observed diameter of a celestial body, expressed in degrees, minutes, and/or seconds of arc. See also stellar diameter.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
Between these dates Mars dims from -0.6 to -0.1, and its apparent diameter decreases from 12" to 9".
A total solar eclipse--when the moon's apparent diameter is larger than the sun, thereby blocking all direct sunlight, turning day into darkness--will occur on Aug.
The Moon makes a full circle relative to the background stars every 27.32 days (sidereal month), moving its own apparent diameter (half a degree) in slightly over an hour.
The apparent diameter versus refractive index values for the two mixtures appear to be slightly shifted, by the equivalent of [approximately equal to] 0.02 in refractive index.
Totality was short but this meant that the apparent diameter of the Moon would be only slightly larger than that of the Sun, so we should see impressive Baily's Beads, prominences and chromosphere.
Because Braemar will be based out at sea on the day, this will limit any man-made light pollution, thereby improving guests' views of the eclipse, and giving them the chance to witness that rarest of phenomena, the "Solar Corona," when the Moon's apparent diameter is larger than the Sun, and creates a "pearly white crown" around the Sun.
Since the apparent diameter of Venus is nearly 1 arc-minute, and apparent diameter of the Sun is 32 arc-minute, hence the planet Venus appears to be only 1/32 of the Sun's apparent diameter.
Urchins oriented significantly only toward targets with an apparent diameter of 12[degrees] (P = 0.005 and P = 0.02), regardless of actual target diameter.
A total solar eclipse occurs when the moonEoACAOs apparent diameter is larger than the sun, he explained further.
The grip-to-grip distance at kink is a measure for kink resistance and is represented as the apparent diameter. The smaller the apparent diameter at kink, the better the kink resistance.
The planet brightens only to magnitude -1.3 (as bright as Sirius), and in a telescope, it reaches an apparent diameter of only 14 arcseconds.