Arcminute

A Arcminute is an Unit of Measurement of angle that corresponds to 1/60 of a degree.

• • …
• Example(s):
  • 1'(arcminute) = 290.8882087 μrad
  • 1' (arcminute) = 60 " (arcsecond).
  • …
• Counter-Example(s):
  • a Minute,
  • an Arcsecond,
  • a Milliarcsecond,
  • a Microarcsecond,
  • a Radian.
• See: Time Duration Scale, Prime Symbol, Unit of Measurement, Time, Angle, Sexagesimal, Hour, Second, Coordinated Universal Time, Time Standard, Leap Second, Minute of Arc, Degree (Angle).

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References

2019a

• (Wikipedia, 2019) ⇒ https://en.wikipedia.org/wiki/Minute Retrieved:2019-1-4.
  • The minute is a unit of time or angle. As a unit of time, the minute is most of times equal to (the first sexagesimal fraction ) of an hour, or 60 seconds. In the UTC time standard, a minute on rare occasions has 61 seconds, a consequence of leap seconds (there is a provision to insert a negative leap second, which would result in a 59-second minute, but this has never happened in more than 40 years under this system). As a unit of angle, the minute of arc is equal to of a degree, or 60 seconds (of arc). Although not an SI unit for either time or angle, the minute is accepted for use with SI units for both. The SI symbols for minute or minutes are min for time measurement, and the prime symbol after a number, e.g. 5′, for angle measurement. The prime is also sometimes used informally to denote minutes of time.

2019b

• (Wikipedia, 2019) ⇒ https://en.wikipedia.org/wiki/Minute_and_second_of_arc Retrieved:2019-1-4.
  • A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is {{of a degree, {{) 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.

    To express even smaller angles, standard SI prefixes can be employed; the milliarcsecond (mas) and microarcsecond (μas), for instance, are commonly used in astronomy.

    The number of square arcminutes in a complete sphere is [math]\displaystyle{ 4 \pi \left(\frac{10\,800}{\pi}\right)^2 = \frac{466\,560\,000}{\pi} \approx }[/math] square arcminutes (the surface area of a unit sphere in square units divided by the solid angle area subtended by a square arcminute, also in square units - so that the final result is a dimensionless number).

2019c

• (Wiktionary, 2019) ⇒ https://en.wiktionary.org/wiki/arcminute#English Retrieved:2019-1-4.
  • QUOTE: A unit of angle; 1/60th of a degree.

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