| 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 " |
| sign | 9.2592592592593 × 10-6 sign | 1.8518518518519 × 10-5 sign | 2.7777777777778 × 10-5 sign | 3.7037037037037 × 10-5 sign | 4.6296296296296 × 10-5 sign | 5.5555555555556 × 10-5 sign | 6.4814814814815 × 10-5 sign | 7.4074074074074 × 10-5 sign | 8.3333333333333 × 10-5 sign | 9.2592592592593 × 10-5 sign | 0.0001019 sign | 0.0001111 sign | 0.0001204 sign | 0.0001296 sign | 0.0001389 sign | 0.0001481 sign | 0.0001574 sign | 0.0001667 sign | 0.0001759 sign | 0.0001852 sign | 0.0001944 sign | 0.0002037 sign | 0.0002130 sign | 0.0002222 sign | 0.0002315 sign | 0.0002407 sign | 0.00025 sign | 0.0002593 sign | 0.0002685 sign | 0.0002778 sign | 0.0002870 sign | 0.0002963 sign | 0.0003056 sign | 0.0003148 sign | 0.0003241 sign | 0.0003333 sign | 0.0003426 sign | 0.0003519 sign | 0.0003611 sign | 0.0003704 sign | 0.0003796 sign | 0.0003889 sign | 0.0003981 sign | 0.0004074 sign | 0.0004167 sign | 0.0004259 sign | 0.0004352 sign | 0.0004444 sign | 0.0004537 sign | 0.0004630 sign | 0.0004722 sign | 0.0004815 sign | 0.0004907 sign | 0.0005 sign | 0.0005093 sign | 0.0005185 sign | 0.0005278 sign | 0.0005370 sign | 0.0005463 sign | 0.0005556 sign | 0.0005648 sign | 0.0005741 sign | 0.0005833 sign | 0.0005926 sign | 0.0006019 sign | 0.0006111 sign | 0.0006204 sign | 0.0006296 sign | 0.0006389 sign | 0.0006481 sign | 0.0006574 sign | 0.0006667 sign | 0.0006759 sign | 0.0006852 sign | 0.0006944 sign | 0.0007037 sign | 0.0007130 sign | 0.0007222 sign | 0.0007315 sign | 0.0007407 sign | 0.00075 sign | 0.0007593 sign | 0.0007685 sign | 0.0007778 sign | 0.0007870 sign | 0.0007963 sign | 0.0008056 sign | 0.0008148 sign | 0.0008241 sign | 0.0008333 sign | 0.0008426 sign | 0.0008519 sign | 0.0008611 sign | 0.0008704 sign | 0.0008796 sign | 0.0008889 sign | 0.0008981 sign | 0.0009074 sign | 0.0009167 sign | 0.0009259 sign |
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 | signs | arcseconds | signs |
|---|---|---|---|
| 1 | ≈ 9.2592592592593E-6 | 6 | ≈ 5.5555555555556E-5 |
| 2 | ≈ 1.8518518518519E-5 | 7 | ≈ 6.4814814814815E-5 |
| 3 | ≈ 2.7777777777778E-5 | 8 | ≈ 7.4074074074074E-5 |
| 4 | ≈ 3.7037037037037E-5 | 9 | ≈ 8.3333333333333E-5 |
| 5 | ≈ 4.6296296296296E-5 | 10 | ≈ 9.2592592592593E-5 |
sign is the unit of plane angle, equals to 30°.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| sign | ≡ 30° | = 0.523599 rad | Metric system SI |
| signs | arcseconds | signs | arcseconds |
|---|---|---|---|
| 1 | ≈ 108000 | 6 | ≈ 648000 |
| 2 | ≈ 216000 | 7 | ≈ 756000 |
| 3 | ≈ 324000 | 8 | ≈ 864000 |
| 4 | ≈ 432000 | 9 | ≈ 972000 |
| 5 | ≈ 540000 | 10 | ≈ 1080000 |
| arcseconds | signs |
|---|---|
| 1 | ≈ 9.2592592592593 × 10-6 |
| 108 000 | ≈ 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 …) |