angular size


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size, angular 

The size of an object measured in terms of the angle it subtends. The point of reference for the eye can be either the nodal point or the centre of the entrance pupil. See extended object; apparent size.
apparent s. 1. The size of an object represented by the angular size. 2. The perceived size of an object as distinguished from the actual size (Fig. S8).
s. constancy See size constancy.
s. lens See aniseikonic lens.
Fig. S8 Objects of different size seen in the same direction and with the same angular size stimulate the same retinal points and thus have the same apparent sizeenlarge picture
Fig. S8 Objects of different size seen in the same direction and with the same angular size stimulate the same retinal points and thus have the same apparent size
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References in periodicals archive ?
Angular size is usually measured in degrees of the arc, although in some research it was shown by pointing to the ends of the imagined object.
At that point, an additional allotment of observing time will continue the search across a field of view roughly the angular size of the full moon.
Also, let's enjoy it while we can - since the Moon's orbit is increasing in size, its angular size is decreasing.
We're tired of the catwalks being full of tall, gaunt, angular size zero models.
This behavior suggests that, in some cases, the emission may originate from a jet consisting of "nuggets" whose angular size are less than 1/[GAMMA], where [GAMMA] is the hulk Lorentz factor.
The group finds variations of about 42 millionths of a kelvin over patches of sky about half the angular size of that scanned by COBE.
So the difference isn't huge, about 13 per cent or so, but it's enough to change the apparent angular size of the moon - enough to be noticeable if you look closely, although most people won't notice on a casual glance.
It lies at a distance of around 25 million light years in the Leo spur of galaxies with a mass estimated at 60 billion Suns, and subtends an angular size on the sky of 12x5.
On the sky, the region - known to astronomers as the Orion Molecular Cloud - is more than 20 times the angular size of the full moon.
Hubble's narrow view covered a swath of sky no bigger in angular size than two percent the area of the full moon.
The Advanced Camera mosaic covers approximately the apparent angular size of the full moon.
angular size The angle subtended by an object on the sky.