دقیقه و ثانیه قوسی: تفاوت میان نسخه‌ها

 

A '''minute of arc''', '''arcminute''', or '''MOA''' is a unit of [[angle|angular measurement]], equal to one sixtieth (1/60) of one [[degree (angle)|degree]]. <ref>[http://wordnet.princeton.edu/perl/webwn?s=minute%20of%20arc WordNet Search - 3.0<!-- Bot generated title -->]</ref> Since one degree is defined as one three hundred sixtieth (1/360) of a circle, 1 MOA is 1/21600 of the amount of arc in a closed circle. It is used in those fields which require a unit for the expression of small angles, such as [[astronomy]] or [[marksmanship]].