| spat | 1 S | 2 S | 3 S | 4 S | 5 S | 6 S | 7 S | 8 S | 9 S | 10 S | 11 S | 12 S | 13 S | 14 S | 15 S | 16 S | 17 S | 18 S | 19 S | 20 S | 21 S | 22 S | 23 S | 24 S | 25 S | 26 S | 27 S | 28 S | 29 S | 30 S | 31 S | 32 S | 33 S | 34 S | 35 S | 36 S | 37 S | 38 S | 39 S | 40 S | 41 S | 42 S | 43 S | 44 S | 45 S | 46 S | 47 S | 48 S | 49 S | 50 S | 51 S | 52 S | 53 S | 54 S | 55 S | 56 S | 57 S | 58 S | 59 S | 60 S | 61 S | 62 S | 63 S | 64 S | 65 S | 66 S | 67 S | 68 S | 69 S | 70 S | 71 S | 72 S | 73 S | 74 S | 75 S | 76 S | 77 S | 78 S | 79 S | 80 S | 81 S | 82 S | 83 S | 84 S | 85 S | 86 S | 87 S | 88 S | 89 S | 90 S | 91 S | 92 S | 93 S | 94 S | 95 S | 96 S | 97 S | 98 S | 99 S | 100 S |
| light-day | 0.0386070 ly | 0.0772139 ly | 0.1158209 ly | 0.1544278 ly | 0.1930348 ly | 0.2316417 ly | 0.2702487 ly | 0.3088556 ly | 0.3474626 ly | 0.3860696 ly | 0.4246765 ly | 0.4632835 ly | 0.5018904 ly | 0.5404974 ly | 0.5791043 ly | 0.6177113 ly | 0.6563182 ly | 0.6949252 ly | 0.7335322 ly | 0.7721391 ly | 0.8107461 ly | 0.8493530 ly | 0.8879600 ly | 0.9265669 ly | 0.9651739 ly | 1.0037808 ly | 1.0423878 ly | 1.0809948 ly | 1.1196017 ly | 1.1582087 ly | 1.1968156 ly | 1.2354226 ly | 1.2740295 ly | 1.3126365 ly | 1.3512434 ly | 1.3898504 ly | 1.4284574 ly | 1.4670643 ly | 1.5056713 ly | 1.5442782 ly | 1.5828852 ly | 1.6214921 ly | 1.6600991 ly | 1.6987060 ly | 1.7373130 ly | 1.7759200 ly | 1.8145269 ly | 1.8531339 ly | 1.8917408 ly | 1.9303478 ly | 1.9689547 ly | 2.0075617 ly | 2.0461686 ly | 2.0847756 ly | 2.1233826 ly | 2.1619895 ly | 2.2005965 ly | 2.2392034 ly | 2.2778104 ly | 2.3164173 ly | 2.3550243 ly | 2.3936312 ly | 2.4322382 ly | 2.4708451 ly | 2.5094521 ly | 2.5480591 ly | 2.5866660 ly | 2.6252730 ly | 2.6638799 ly | 2.7024869 ly | 2.7410938 ly | 2.7797008 ly | 2.8183077 ly | 2.8569147 ly | 2.8955217 ly | 2.9341286 ly | 2.9727356 ly | 3.0113425 ly | 3.0499495 ly | 3.0885564 ly | 3.1271634 ly | 3.1657703 ly | 3.2043773 ly | 3.2429843 ly | 3.2815912 ly | 3.3201982 ly | 3.3588051 ly | 3.3974121 ly | 3.4360190 ly | 3.4746260 ly | 3.5132329 ly | 3.5518399 ly | 3.5904469 ly | 3.6290538 ly | 3.6676608 ly | 3.7062677 ly | 3.7448747 ly | 3.7834816 ly | 3.8220886 ly | 3.8606955 ly |
The spat (symbol S) is also an obsolete unit of distance used in astronomy. It is equal to 1000000000 kilometres (1 Tm or 1012 m). It is about 6.6846 astronomical units (AU), 1.057×10−4 light-years or3.240×10−5 parsecs.
| 1 spats ≡ 0.038606955462749 light-days | 4 spats ≡ 0.154427821851 light-days |
| 1.5 spats ≡ 0.057910433194124 light-days | 4.5 spats ≡ 0.17373129958237 light-days |
| 2 spats ≡ 0.077213910925498 light-days | 5 spats ≡ 0.19303477731375 light-days |
| 2.5 spats ≡ 0.096517388656873 light-days | 5.5 spats ≡ 0.21233825504512 light-days |
| 3 spats ≡ 0.11582086638825 light-days | 6 spats ≡ 0.23164173277649 light-days |
The light-day is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in oneday, and is equal to exactly 2.59020683712×1013 metres.
| 1 light-days ≡ 25.9020683712 spats | 4 light-days ≡ 103.6082734848 spats |
| 1.5 light-days ≡ 38.8531025568 spats | 4.5 light-days ≡ 116.5593076704 spats |
| 2 light-days ≡ 51.8041367424 spats | 5 light-days ≡ 129.510341856 spats |
| 2.5 light-days ≡ 64.755170928 spats | 5.5 light-days ≡ 142.4613760416 spats |
| 3 light-days ≡ 77.7062051136 spats | 6 light-days ≡ 155.4124102272 spats |
| 1 spats ≡ 0.0386070 light-days |
| 1 light-days ≡ 25.9020684 spats |