Minute and second of arc

（重定向自Minutes of arc）

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	Minutes of arc
释义	Minutes of arc 原声例句奇趣工程百科 While crawling up the 5% grade to the launch location, the crawler uses a ladder guiding system and a leveling device to maintain the mobile launcher platform level with 10 minutes of arc. 当爬行5%坡度到达发射位置时，履带车利用梯子引导系统和调平装置以10分钟弧度保持移动发射器平台水平。英语百科 Minute and second of arc （重定向自Minutes of arc） 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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