Angular minutes, also called arcminutes, are measuresangleOfCompanyThe symbol is', which can be abbreviated as "fen" when it will not cause confusion.The word "Jiao Fen" is only used to describe the angle, and cannot be used in other cases where the unit is "Fen" (such as time, or exam score).
The ancient Babylonians putcircumferencePerform 360 equal divisions, and take one of them as 1 "degree", which is recorded as 1 °. There are also units of "minute" and "second" below the degree. 60 minutes is 1 degree, and 60 seconds is 1 minute.[3]
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One degree equals 60 minutes, and one minute equals 60 seconds.Expressed by mathematical equation, namely:
As in cartography, astronomy uses the unit of angular minutes.Degrees, minutes and seconds are used to express the right ascension, or in the celestial sphereequatorAngular distance south or north.Angular minutes are also used in astronomy to expressparallax, which is often used in this field.For example, the angle of the moon in the sky (that is, the angular diameter) just exceeds 30 minutes (half a degree).[2]
Human Vision
For humansvisionNormal visual acuity is the resolution of one corner.
military
In the gun upper accuracy (MOA), the 1 MOA solution is "within 1 inch of the 100 yard dispersion range".
