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A second of arc, or arcsecond (arsec) is 1/60 of an arcminute, 1/3600 of a degree, 1/1296000 of a turn, and π/648000 (about 1/206265) of a radian.
In relation to the base unit of [angle] => (radians), 1 Second Of Arc (SOA) is equal to 4.848137E-6 radians, while 1 Rotations (rot) = 6.28319 radians.| 21 Second Of Arc | to common angle units |
|---|---|
| 21 SOA | = 0.000101810877 radians (rad) |
| 21 SOA | = 0.101810877 milliradians (mrad/mil) |
| 21 SOA | = 0.10370367650354 angular mils (µ mil) |
| 21 SOA | = 0.0058333333331402 degrees (°deg) |
| 21 SOA | = 0.0064814818445905 gradians (grad) |
| 21 SOA | = 0.35000026470669 arcminutes (arcmin) |
| 21 SOA | = 21 arcseconds (arcsec) |
| 21 SOA | = 9.7222184343362E-5 sextants (60°) |
| 21 SOA | = 0.0001944439973262 signs (30°) |
| 21 SOA | = 1.6203692232767E-5 turns (t) |