The angular diameter, angular size, apparent diameter, or apparent size is an angular distance describing how large a sphere or circle appears from a...

In astronomy, angular diameter distance is a distance defined in terms of an object's physical size, x {\displaystyle x} , and its angular size, θ {\displaystyle...

extrasolar star whose photosphere's angular size was measured in 1920, and subsequent studies have reported an angular diameter (i.e., apparent size) ranging...

the galaxy and its estimated distance, leading to an angular diameter (also called "metric diameter"). This type of measurement is subject to two significant...

the diameter is 51.18±2.24 mas. The angular diameter of R Doradus is larger than any other measured star other than the Sun. The angular diameter of the...

dominated by diffraction. In that case, the angular resolution of an optical system can be estimated (from the diameter of the aperture and the wavelength of...

relating the diameter to the radius. Angular diameter – How large a sphere or circle appears Caliper, micrometer, tools for measuring diameters Conjugate...

thousands of R☉, comparable to some of the largest known black holes. The angular diameters of stars can be measured directly using stellar interferometry. Other...

the transverse comoving distance the "angular size distance", which is not to be mistaken for the angular diameter distance. Occasionally, the symbols χ...

vein Angular (web framework), an open-source web platform AngularJS, the first incarnation of Angular Angle, having an angle or angles Angular diameter, describing...

size is R Doradus, with an angular diameter of only 0.057 arcseconds. The disks of most stars are much too small in angular size to be observed with current...

from Earth. The change in angular diameter of the Sun with distance is illustrated in the diagram below: The angular diameter of a circle whose plane is...

describe small astronomical angles such as the angular diameters of planets (e.g. the angular diameter of Venus which varies between 10″ and 60″); the...

in the constellation Taurus. It is a semiregular variable and its angular diameter has been measured at about 10 mas. It is a similar star to Betelgeuse...

celestial object in Earth's night sky. This is mainly due to its large angular diameter, while the reflectance of the lunar surface is comparable to that of...

magnetic fields of stars List of directly imaged exoplanets Angular resolution Angular diameter List of nearest stars H.Uitenbroek; Dupree, A. K.; Gilliland...

Cassiopeiae's angular diameter was measured in 1998 at various wavelengths ranging from 500 to 850 nm. The result was a limb darkened angular measurement...

statistics (mean, standard deviation) Angle bisector Angular acceleration Angular diameter Angular velocity Argument (complex analysis) Astrological aspect...

Nebula, the brightest nebula in the sky and occupying an area twice the angular diameter of the full Moon, can be viewed with the naked eye but was missed by...

arcminutes (approximately 1/4 of a degree, half the angular width of Earth's moon) in angular diameter, containing Proxima Centauri, so the signal could...

the disk's radius. If instead the disk rotates about its diameter (e.g. coin toss), its angular momentum L {\displaystyle L} is given by L = 1 2 π M f r...

measurements of the radius at infrared (K-band = 2.2 μm) wavelength gave an angular diameter of 18.7±0.5 mas, corresponding to radii above 3,000 R☉ (2.1×109 km;...

of 4 Vesta, which will transits the Sun on January 4, 2044, with an angular diameter of 0.24″. From the perspective of Earth, the only types of asteroids...

its angular diameter as large as possible). Earth being very near aphelion (furthest away from the Sun in its elliptical orbit, making its angular diameter...

in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. It is defined such that one...

change in azimuth or elevation less than or equal to about 1/60 of the angular diameter of the Sun. Observing that it occurred within a two-day period is easier...

proximity to Earth, its angular diameter can be measured directly. Its actual diameter is about one-seventh (14%) the diameter of the Sun. Although it...

to those objects' angular diameter or lack of scientific significance. Most such objects are open clusters of large angular diameter that would require...

the cosmic distance ladder. The relation between the angular diameter, θ, actual (physical) diameter, r, and distance, D, of an object from the observer...

characterized by the angular diameter of the long-exposure image of a star (seeing disk) or by the Fried parameter r0. The diameter of the seeing disk is...