| arcsecond | 1 " | 2 " | 3 " | 4 " | 5 " | 6 " | 7 " | 8 " | 9 " | 10 " | 11 " | 12 " | 13 " | 14 " | 15 " | 16 " | 17 " | 18 " | 19 " | 20 " | 21 " | 22 " | 23 " | 24 " | 25 " | 26 " | 27 " | 28 " | 29 " | 30 " | 31 " | 32 " | 33 " | 34 " | 35 " | 36 " | 37 " | 38 " | 39 " | 40 " | 41 " | 42 " | 43 " | 44 " | 45 " | 46 " | 47 " | 48 " | 49 " | 50 " | 51 " | 52 " | 53 " | 54 " | 55 " | 56 " | 57 " | 58 " | 59 " | 60 " | 61 " | 62 " | 63 " | 64 " | 65 " | 66 " | 67 " | 68 " | 69 " | 70 " | 71 " | 72 " | 73 " | 74 " | 75 " | 76 " | 77 " | 78 " | 79 " | 80 " | 81 " | 82 " | 83 " | 84 " | 85 " | 86 " | 87 " | 88 " | 89 " | 90 " | 91 " | 92 " | 93 " | 94 " | 95 " | 96 " | 97 " | 98 " | 99 " | 100 " |
| angular mil | 0.3143801 µ | 0.6287603 µ | 0.9431404 µ | 1.2575206 µ | 1.5719007 µ | 1.8862808 µ | 2.2006610 µ | 2.5150411 µ | 2.8294213 µ | 3.1438014 µ | 3.4581815 µ | 3.7725617 µ | 4.0869418 µ | 4.4013220 µ | 4.7157021 µ | 5.0300822 µ | 5.3444624 µ | 5.6588425 µ | 5.9732227 µ | 6.2876028 µ | 6.6019829 µ | 6.9163631 µ | 7.2307432 µ | 7.5451234 µ | 7.8595035 µ | 8.1738836 µ | 8.4882638 µ | 8.8026439 µ | 9.1170241 µ | 9.4314042 µ | 9.7457843 µ | 10.0601645 µ | 10.3745446 µ | 10.6889248 µ | 11.0033049 µ | 11.3176850 µ | 11.6320652 µ | 11.9464453 µ | 12.2608255 µ | 12.5752056 µ | 12.8895857 µ | 13.2039659 µ | 13.5183460 µ | 13.8327262 µ | 14.1471063 µ | 14.4614864 µ | 14.7758666 µ | 15.0902467 µ | 15.4046269 µ | 15.7190070 µ | 16.0333871 µ | 16.3477673 µ | 16.6621474 µ | 16.9765276 µ | 17.2909077 µ | 17.6052878 µ | 17.9196680 µ | 18.2340481 µ | 18.5484283 µ | 18.8628084 µ | 19.1771885 µ | 19.4915687 µ | 19.8059488 µ | 20.1203290 µ | 20.4347091 µ | 20.7490892 µ | 21.0634694 µ | 21.3778495 µ | 21.6922297 µ | 22.0066098 µ | 22.3209899 µ | 22.6353701 µ | 22.9497502 µ | 23.2641304 µ | 23.5785105 µ | 23.8928906 µ | 24.2072708 µ | 24.5216509 µ | 24.8360310 µ | 25.1504112 µ | 25.4647913 µ | 25.7791715 µ | 26.0935516 µ | 26.4079317 µ | 26.7223119 µ | 27.0366920 µ | 27.3510722 µ | 27.6654523 µ | 27.9798324 µ | 28.2942126 µ | 28.6085927 µ | 28.9229729 µ | 29.2373530 µ | 29.5517331 µ | 29.8661133 µ | 30.1804934 µ | 30.4948736 µ | 30.8092537 µ | 31.1236338 µ | 31.4380140 µ |
A second of arc, arcsecond (arcsec), arc second, or second arc is a unit of angular measurement equal to 1/3600 of one degree.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| arcsecond | " | ≡ 1°⁄3600 | ≈ 4.848137×10−6 rad | Metric system SI |
| arcseconds | angular mils | arcseconds | angular mils |
|---|---|---|---|
| 1 | ≈ 0.31438013986526 | 6 | ≈ 1.8862808391915 |
| 2 | ≈ 0.62876027973051 | 7 | ≈ 2.2006609790568 |
| 3 | ≈ 0.94314041959577 | 8 | ≈ 2.5150411189221 |
| 4 | ≈ 1.257520559461 | 9 | ≈ 2.8294212587873 |
| 5 | ≈ 1.5719006993263 | 10 | ≈ 3.1438013986526 |
A angular mil is the unit of angular measurement equal to 1/6400 of a complete circle. At 1000 metres one mil subtends about one metre (~0,98 m). Also 1/6000 and 1/6300 are used in other countries.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| angular mil | µ | ≡ 2π⁄6400 rad | ≈ 0.981748×10−3 rad | Metric system SI |
| angular mils | arcseconds | angular mils | arcseconds |
|---|---|---|---|
| 1 | ≈ 3.1808625075 | 6 | ≈ 19.085175045 |
| 2 | ≈ 6.361725015 | 7 | ≈ 22.2660375525 |
| 3 | ≈ 9.5425875225 | 8 | ≈ 25.44690006 |
| 4 | ≈ 12.72345003 | 9 | ≈ 28.6277625675 |
| 5 | ≈ 15.9043125375 | 10 | ≈ 31.808625075 |
| arcseconds | angular mils |
|---|---|
| 1 | ≈ 0.3143801 |
| 3.1808625 | ≈ 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |