Plane angles have been measured in many different units. The most contemporary units are the degree ( ° ) and radian (rad), but many others have been used throughout history.
The radian (rad) is the SI unit for measuring angles. one radian is just under 57.3 degrees. Accepted prefixes still not accepted in pure math.
A second of arc, others names: arcsecond (arcsec), or arc second is 160 of an arcminute, 13600 of a degree, 11296000 of a turn, and π648000 (about 1206264. 8) of a radian.
Divide the second of arc value by 206264.798210
radian = second of arc / 206264.798210
Multiply the radian value by 206264.798210
second of arc = radian x 206264.798210
One radian (rad) is equal to 206264.798210 second of arc (")
1 radian (rad) = 206264.798210 second of arc (")
One second of arc (") is equal to 0.000005 radian (rad)
1 second of arc (") = 0.000005 radian (rad)
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