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(New page: {{ExpPsy}} A '''minute of arc''', '''arcminute''', or '''MOA''' is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. Since one degree ...)
 
 
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{{ExpPsy}}
 
{{ExpPsy}}
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]]. 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, or (&pi;/10800) [[radian]]s. It is used in those fields which require a unit for the expression of small angles, such as [[astronomy]]. The [[SI]] symbol for marking the arcminute is the [[prime (symbol)|prime]] (&#8242;) (<code>U+2032</code>, <code>&amp;prime;</code>), though a single quote (') (U+0027) is commonly used where only [[ASCII]] characters are permitted. One arcminute is written 1&#8242; (or 1''&#39;''). It is also abbreviated as '''arcmin''' or '''amin''' or, less commonly, the prime with a [[circumflex]] over it (<math>\hat{'}</math>).
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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]]. 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, or (&pi;/10800) [[radian]]s. It is used in those fields which require a unit for the expression of small angles, such as [[psychophysics]]. The [[SI]] symbol for marking the arcminute is the [[prime (symbol)|prime]] (&#8242;) (<code>U+2032</code>, <code>&amp;prime;</code>), though a single quote (') (U+0027) is commonly used where only [[ASCII]] characters are permitted. One arcminute is written 1&#8242; (or 1''&#39;''). It is also abbreviated as '''arcmin''' or '''amin''' or, less commonly, the prime with a [[circumflex]] over it (<math>\hat{'}</math>).
   
 
The subdivision of the minute of arc is the '''second of arc''', or '''arcsecond'''. There are 60 arcseconds in an arcminute. Therefore, the arcsecond is 1/1296000 of a circle, or (&pi;/648000) [[radian]]s, which is approximately 1/206265 [[radian]]. The symbol for the arcsecond is the double prime (&#8243;) (<code>U+2033</code>). To express even smaller angles, standard [[SI prefix]]es can be employed; in particular, the '''milliarcsecond''', abbreviated '''mas''', is sometimes used in [[astronomy]].
 
The subdivision of the minute of arc is the '''second of arc''', or '''arcsecond'''. There are 60 arcseconds in an arcminute. Therefore, the arcsecond is 1/1296000 of a circle, or (&pi;/648000) [[radian]]s, which is approximately 1/206265 [[radian]]. The symbol for the arcsecond is the double prime (&#8243;) (<code>U+2033</code>). To express even smaller angles, standard [[SI prefix]]es can be employed; in particular, the '''milliarcsecond''', abbreviated '''mas''', is sometimes used in [[astronomy]].

Latest revision as of 07:21, June 20, 2007

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A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. 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, or (π/10800) radians. It is used in those fields which require a unit for the expression of small angles, such as psychophysics. The SI symbol for marking the arcminute is the prime (′) (U+2032, &prime;), though a single quote (') (U+0027) is commonly used where only ASCII characters are permitted. One arcminute is written 1′ (or 1'). It is also abbreviated as arcmin or amin or, less commonly, the prime with a circumflex over it (\hat{'}).

The subdivision of the minute of arc is the second of arc, or arcsecond. There are 60 arcseconds in an arcminute. Therefore, the arcsecond is 1/1296000 of a circle, or (π/648000) radians, which is approximately 1/206265 radian. The symbol for the arcsecond is the double prime (″) (U+2033). To express even smaller angles, standard SI prefixes can be employed; in particular, the milliarcsecond, abbreviated mas, is sometimes used in astronomy.


Human visionEdit

In humans, the ability to resolve a spatial pattern separated by a visual angle of one minute of arc is considered normal visual acuity.[1]

ReferencesEdit

  1. Guns and Shooting Online, Chuck Hawks
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