Sentences with phrase «angular diameter»

"Angular diameter" refers to the size of an object as it appears from a particular viewpoint, measured in degrees. It describes how large an object appears to be when observed from a specific location. Full definition
It appears quite small without a telescope because only the central part is bright enough to be visible, but the full angular diameter of the galaxy is seven times that of the full moon.
Note that this effect of size on the perceived contrast can not be explained by the finite resolution of the visual system, because we used disks with angular diameter much larger than that of the Airy disk, and the effect was exactly the same for disks of the two different diameters we used.
[8] The estimated angular diameter of this star is about 0.92 mas.
[3] The measured angular diameter, after correction for limb darkening, is 7000231999999999999 ♠ 2.32 ± 0.02 mas.
The bending due to refraction at sunset is just about 0.5 degree — roughly the same as the angular diameter of the disk of the sun.
For comparison, Earth's Moon has an angular diameter of about two billion microarcseconds, and the required resolution is that required to resolve objects separated by two inches on the Moon's surface.
It shows an area of sky large 13,9 ° x 13,9 ° (for comparison, the full - Moon has an angular diameter of about 0,5 °).
All of these groups are ones containing at least 3 galaxies with an angular diameter larger than 100 arcseconds - a measure which is obviously biased towards closer groups.
[42] This is about four times the angular diameter of the Full Moon, and almost exactly half the distance between Alpha Centauri AB and Beta Centauri.
This planetary nebula is certainly the most impressive object of its kind in the sky, as the angular diameter of the luminous body is nearly 6 arc minutes, with a faint halo extensing out to over 15», half the apparent diameter of the Moon (Millikan 1974).
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