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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 Hour Angles (HA) is equal to 0.26179938779 radians, while 1 Second Of Arc (SOA) = 4.848137E-6 radians.| 9900 Hour Angles | to common angle units |
|---|---|
| 9900 HA | = 2591.813939121 radians (rad) |
| 9900 HA | = 2591813.939121 milliradians (mrad/mil) |
| 9900 HA | = 2639999.2046034 angular mils (µ mil) |
| 9900 HA | = 148499.99420368 degrees (°deg) |
| 9900 HA | = 165000.00280883 gradians (grad) |
| 9900 HA | = 8910006.3911918 arcminutes (arcmin) |
| 9900 HA | = 534599979.15096 arcseconds (arcsec) |
| 9900 HA | = 2474.9989391892 sextants (60°) |
| 9900 HA | = 4949.9884246008 signs (30°) |
| 9900 HA | = 412.49969189552 turns (t) |