Arc of lowitz
a halo or arc of light, occurring infrequently, which extends diagonally downward from a 22° parhelion.
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- Arc sec
. arc secant
- Arc secant
the angle, measured in radians, that has a secant equal to a given number. Symbol: sec −1. Abbreviation: arc sec; arc secant The inverse of the secant function.
- Arc second
Astronomy, 2 (def 4).
- Arc sin
. arc sine
- Arc sine
the angle, measured in radians, that has a sine equal to a given number. Symbol: sin −1. Abbreviation: arc sin; arc sine The inverse of the sine function.