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 " |
twelfth circle | 9.2592592592593 × 10-6 1/12 circle | 1.8518518518519 × 10-5 1/12 circle | 2.7777777777778 × 10-5 1/12 circle | 3.7037037037037 × 10-5 1/12 circle | 4.6296296296296 × 10-5 1/12 circle | 5.5555555555556 × 10-5 1/12 circle | 6.4814814814815 × 10-5 1/12 circle | 7.4074074074074 × 10-5 1/12 circle | 8.3333333333333 × 10-5 1/12 circle | 9.2592592592593 × 10-5 1/12 circle | 0.0001019 1/12 circle | 0.0001111 1/12 circle | 0.0001204 1/12 circle | 0.0001296 1/12 circle | 0.0001389 1/12 circle | 0.0001481 1/12 circle | 0.0001574 1/12 circle | 0.0001667 1/12 circle | 0.0001759 1/12 circle | 0.0001852 1/12 circle | 0.0001944 1/12 circle | 0.0002037 1/12 circle | 0.0002130 1/12 circle | 0.0002222 1/12 circle | 0.0002315 1/12 circle | 0.0002407 1/12 circle | 0.00025 1/12 circle | 0.0002593 1/12 circle | 0.0002685 1/12 circle | 0.0002778 1/12 circle | 0.0002870 1/12 circle | 0.0002963 1/12 circle | 0.0003056 1/12 circle | 0.0003148 1/12 circle | 0.0003241 1/12 circle | 0.0003333 1/12 circle | 0.0003426 1/12 circle | 0.0003519 1/12 circle | 0.0003611 1/12 circle | 0.0003704 1/12 circle | 0.0003796 1/12 circle | 0.0003889 1/12 circle | 0.0003981 1/12 circle | 0.0004074 1/12 circle | 0.0004167 1/12 circle | 0.0004259 1/12 circle | 0.0004352 1/12 circle | 0.0004444 1/12 circle | 0.0004537 1/12 circle | 0.0004630 1/12 circle | 0.0004722 1/12 circle | 0.0004815 1/12 circle | 0.0004907 1/12 circle | 0.0005 1/12 circle | 0.0005093 1/12 circle | 0.0005185 1/12 circle | 0.0005278 1/12 circle | 0.0005370 1/12 circle | 0.0005463 1/12 circle | 0.0005556 1/12 circle | 0.0005648 1/12 circle | 0.0005741 1/12 circle | 0.0005833 1/12 circle | 0.0005926 1/12 circle | 0.0006019 1/12 circle | 0.0006111 1/12 circle | 0.0006204 1/12 circle | 0.0006296 1/12 circle | 0.0006389 1/12 circle | 0.0006481 1/12 circle | 0.0006574 1/12 circle | 0.0006667 1/12 circle | 0.0006759 1/12 circle | 0.0006852 1/12 circle | 0.0006944 1/12 circle | 0.0007037 1/12 circle | 0.0007130 1/12 circle | 0.0007222 1/12 circle | 0.0007315 1/12 circle | 0.0007407 1/12 circle | 0.00075 1/12 circle | 0.0007593 1/12 circle | 0.0007685 1/12 circle | 0.0007778 1/12 circle | 0.0007870 1/12 circle | 0.0007963 1/12 circle | 0.0008056 1/12 circle | 0.0008148 1/12 circle | 0.0008241 1/12 circle | 0.0008333 1/12 circle | 0.0008426 1/12 circle | 0.0008519 1/12 circle | 0.0008611 1/12 circle | 0.0008704 1/12 circle | 0.0008796 1/12 circle | 0.0008889 1/12 circle | 0.0008981 1/12 circle | 0.0009074 1/12 circle | 0.0009167 1/12 circle | 0.0009259 1/12 circle |
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 | twelfth circles | arcseconds | twelfth circles |
---|---|---|---|
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 |
1/12 circle or twelfth circle is equal to 360°/12 = 30°. Plural name is twelfth circles.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
twelfth circle | 1/12 circle | ≡ 30° | = 0.523598767 rad | Metric system SI |
twelfth circles | arcseconds | twelfth circles | arcseconds |
---|---|---|---|
1 | ≈ 108000 | 6 | ≈ 648000 |
2 | ≈ 216000 | 7 | ≈ 756000 |
3 | ≈ 324000 | 8 | ≈ 864000 |
4 | ≈ 432000 | 9 | ≈ 972000 |
5 | ≈ 540000 | 10 | ≈ 1080000 |
arcseconds | twelfth circles |
---|---|
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 …) |