Minute and second of arc

（重定向自Milliarcseconds）

Comparison of angular diameter of the Sun, Moon, planets and the International Space Station. To get a true representation of the sizes, view the image at a distance of 103 times the width of the

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to one-sixtieth (1/60) of one degree. As one degree is 1/360 of a circle, one minute of arc is 1/21600 of a circle (or, in radians, $π$ /10800). A second of arc, arcsecond (arcsec), or arc second is 1/60 of an arcminute, 1/3,600 of a degree, 1/1,296,000 of a circle, and $π$ /648,000 (about 1/206,265) of a radian. These units originated in Babylonian astronomy as sexagesimal subdivisions of the degree; they are used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying and marksmanship.

单词	Milliarcseconds
释义	Milliarcseconds 原声例句 VOA常速英语_欧洲 What Gaia is also able to do is to measure those parallaxes down to a level of something like a few hundredths of arcseconds, of milliarcseconds. 盖亚还能够做到的是，将这些视差测量到几百分之一角秒或毫角秒的水平。英语百科 Minute and second of arc （重定向自Milliarcseconds） A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to one-sixtieth (1/60) of one degree. As one degree is 1/360 of a circle, one minute of arc is 1/21600 of a circle (or, in radians, $π$ /10800). A second of arc, arcsecond (arcsec), or arc second is 1/60 of an arcminute, 1/3,600 of a degree, 1/1,296,000 of a circle, and $π$ /648,000 (about 1/206,265) of a radian. These units originated in Babylonian astronomy as sexagesimal subdivisions of the degree; they are used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying and marksmanship.
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