Examples of using Angular diameter in English and their translations into Ukrainian
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The apparent angular diameter of Neptune is about 2“.
This can be done with the light of some stars to measure their angular diameters.
As it happens, the angular diameters of the Sun and Moon are very nearly the same.
Galaxies are large objects, so they subtend measurable angular diameters on the sky.
For instance, for a small angular diameter, a moving sphere remains circular and is rotated.
Uranus is a relatively faint object, and its visible angular diameter is smaller than 4″.
Plot of angular diameter(in arcminutes) versus redshift for 25 randomly selected galaxies.
Unlike Earth's Moon, Phobos's phases and angular diameter visibly change from hour to hour;
All other factors are known,so from the data we can calculate how large the angular diameter is.
Redshift, apparent magnitude V, and angular diameter measurements for 25 randomly selected galaxies.
In astronomy the term apparent sizerefers to the physical angle V{\displaystyle V} or angular diameter.
Assuming that galaxies are the same size, angular diameters of galaxies ought to decrease with increasing distance.
Observing that it occurred within a two day period is easier,requiring an observation precision of only about 1/16 of the angular diameter of the sun.
However, we can convert the angular diameter to actual linear diameter(in kilometers) only if we know the distance to the star.
These three galaxies appear to be smaller than galaxies of similar low redshifts,having angular diameters similar to galaxies with zgt; 0.1.
The angular diameter of La Superba has been measured at 13.81 mas.[14] It is expected to be pulsating but this has not been seen in the measurements.
Deimos rises in the east and sets in the west, like a"normal" moon,although its appearance to the naked eye would be starlike(angular diameter between 1.8′ and 2.1′).
With the advances in optical interferometry in the 1990s, Schedar's angular diameter was measured in 1998 at various wavelengths ranging from 500- 850 nm.
It is principally used to measure the angular separation between the components of closebinary stars(components that are close in brightness) and the angular diameters of stars.
Additionally, if the redshifts of galaxies are cosmological,then one would expect angular diameters of galaxies to decrease with increasing redshift.
I also have shown that galaxy angular diameters decrease with increasing redshift, an additional test that confirms that galaxy redshifts are cosmological.
The transits of Phobos could also becalled partial eclipses of the Sun by Phobos, since the angular diameter of Phobos is up to half the angular diameter of the Sun.
Unlike Earth's Moon, Phobos's phases and angular diameter visibly change from hour to hour; Deimos is too small for its phases to be visible with the naked eye.
As a result, Phobos is not visible from latitudes north of 70.4°N or south of 70.4°S; Deimos is not visible from latitudes north of 82.7°N or south of 82.7°S. Observers at high latitudes(less than 70.4°)would see a noticeably smaller angular diameter for Phobos because they are farther away from it.
In 1873,Stephan was the first person to attempt to measure the angular diameter of a star using interferometry, converting the 80 cm telescope at Marseille Observatory into an interferometer.
The moon Phobos appears about one third the angular diameter that the full Moon appears from Earth; on the other hand, Deimos appears more or less starlike with a disk barely discernible if at all.
Its estimated age is 420 million years and it has evolved away from the main sequence to become a giant star with a spectral classification of K3 and luminosity class between II andIII.[5] The angular diameter has been measured using long baseline interferometry, yielding a value of 9.09± 0.09 milliarcseconds, only beaten in it by Betelgeuse and R Doradus.[16] It has expanded to 50 times the radius of the Sun.[5].
It also suffers from the limitation that only stars with very large angular diameters can be measured,so it is restricted to much larger angular diameter stars than the lunar occultation method.
Observers at high latitudes(but less than 70.4°)will see a noticeably smaller angular diameter for Phobos because they are considerably farther away from it than observers at Mars's equator.
Therefore, if galaxy redshifts are cosmological,then there ought to be a linear relationship between galaxy angular diameters and redshift(the redshifts are so small in the galaxy sample here that redshifts and distance ought to be directly proportional, regardless of cosmological models).