Examples of using Angular diameter in English and their translations into Vietnamese
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It has an angular diameter of about 2'.
The parallax is only about a quarter of the angular diameter of the star.
The angular diameter of La Superba has been measured at 13.81 mas.
Combining this with the change in angular diameter gives the distance.
The angular diameter of the Sun, from a distance of one light-year, is 0.03″, and that of Earth 0.0003″.
At a distance of 0.53 AU from Earth, its angular diameter was only 7 milliseconds of arc, far too small to see.
The angular diameter of La Superba has been measured at 13.81 mas.[15] It is expected to be pulsating but this has not been seen in the measurements.
At its distance from the Sun, the Sun's angular diameter is reduced to a tiny disk about 2 arcminutes across.
By precisely measuring the drop in brightness of a star as it is occulted by the Moon(or therise in brightness when it reappears), the star's angular diameter can be computed.
Janus, a very close moon to Saturn, has an angular diameter of about 7', meaning that it can fully cover the sun.
The mean angular diameter of the Sun as viewed from Jupiter is 372 arc-seconds, or 6' 12"(about 1⁄5 that of the Sun as viewed from Earth), varying slightly from 381" at perihelion to 357" at aphelion.
The Dark River, pictured above across the upper left,spans over 20 times the angular diameter of the Moon and lies about 500 light years distant.
It is now possible to measure the angular diameter of the pulsating star directly using optical interferometers, allowing a more accurate measurement of the star's distance.
At its estimated distance of around 4,500 light-years(1,400 parsecs)[1] from Earth,the cluster's angular diameter of 24 arcminutes corresponds to a physical extent of about 20- 25 ly(6.1- 7.7 pc).
Earth's angular diameter(1.9°) is four times the Moon's as seen from Earth, although because the Moon's orbit is eccentric, Earth's apparent size in the sky varies by about 5% either way(ranging between 1.8° and 2.0° in diameter). .
The magnitude of eclipse is the fraction of the angular diameter of a celestial body being eclipsed.[1] This applies to all celestial eclipses.
Unfortunately, observations of such transits are difficult because all of theseasteroids are only a few kilometres in diameter  at most, so that their angular diameter is too tiny to observe against the Sun.
From its surface, the star would have an angular diameter of 1.24 degrees and would appear to be 2.3 times the visual diameter  of our Sun as it appears from the surface of the Earth.
In an annular solar eclipse,the magnitude of the eclipse is the ratio between the apparent angular diameters of the Moon and that of the Sun during the maximum eclipse, yielding a ratio less than 1.0.
The interferometry-measured angular diameter of this star, after correcting for limb darkening, is 4.85± 0.05 mas,[1] which, at its estimated distance, equates to a physical radius of about 12 times the radius of the Sun.[2] The effective temperature of the outer envelope is 4,498 K,[3] giving it an orange hue that is characteristic of a K-type star.[4].
Both can be measured with great accuracy in certain cases,with cool supergiants having large angular diameters, some cool evolved stars having masers in their atmospheres that can be used to measure the parallax using VLBI.
Between different full moons, the Moon's angular diameter can vary from 29.43 arcminutes at apogee to 33.5 arcminutes at perigee- an increase of around 14% in apparent diameter  or 30% in apparent area.
Similarly, asteroid 30825(1990 TG1) transited on April 14, 2005 but was again unobservable,having an angular diameter of about 0.05", and 2101 Adonis transited on September 24, 2007 with an even smaller angular diameter of only 0.005".
Likewise, about 600 million years from now(assuming that the angular diameter of the Sun will not change), the Moon will no longer cover the Sun completely and only annular eclipses will occur.
Likewise, about 600 million years from now(if the angular diameter of the Sun does not change), the Moon will no longer cover the Sun completely, and only annular eclipses will occur.[104].
By March 2003 the size of thelight echo in the sky was twice the angular diameter of Jupiter and was continuing to grow.[19] Jupiter's angular diameter varies from 30 to 51 arcseconds.
Note that between different full moons, the Moon's angular diameter can vary from 29.43 arc minutes at apogee to 33.5 arc minutes at perigee- an increase of around 14% in apparent diameter  or 30% in apparent area.
Additionally, in Lingxian, Zhang Heng also calculated the angular diameter of the sun and the moon, and recorded 2,500 stars that he observed while in Luoyang, calculations that are very close to the results modern astronomers have observed.
Such an event might be observable(an asteroid with 25 metresdiameter  at a distance of 380,000 km has an angular diameter of 0.01"), but none has been observed as yet, although there have been some reports of such events, sometimes classified as UFO-sightings.