Arcsecond
An angular measurement which corresponds to one three hundred and sixtieth of a degree. See also arcminute . | ||||
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Arc Second Definition from Entertainment & Music Dictionaries & Glossaries
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Arc second
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Arc Second Definition from Science & Technology Dictionaries & Glossaries
| Solar Physics Glossary |
Arc Second
Abbreviated arcsec. A unit of angular measure in which there are 60 arc seconds in 1 arc minute and therefore 3600 arc seconds in 1 arc degree . One arc second is equal to about 725 km on the Sun.
Abbreviated arcsec. A unit of angular measure in which there are 60 arc seconds in 1 arc minute and therefore 3600 arc seconds in 1 arc degree . One arc second is equal to about 725 km on the Sun.
Arc Second Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Minute of arc
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 astronomy. The SI symbol for marking the arcminute is the prime (′) (U+2032), 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 (
).
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