| lunar distance | 1 LD | 2 LD | 3 LD | 4 LD | 5 LD | 6 LD | 7 LD | 8 LD | 9 LD | 10 LD | 11 LD | 12 LD | 13 LD | 14 LD | 15 LD | 16 LD | 17 LD | 18 LD | 19 LD | 20 LD | 21 LD | 22 LD | 23 LD | 24 LD | 25 LD | 26 LD | 27 LD | 28 LD | 29 LD | 30 LD | 31 LD | 32 LD | 33 LD | 34 LD | 35 LD | 36 LD | 37 LD | 38 LD | 39 LD | 40 LD | 41 LD | 42 LD | 43 LD | 44 LD | 45 LD | 46 LD | 47 LD | 48 LD | 49 LD | 50 LD | 51 LD | 52 LD | 53 LD | 54 LD | 55 LD | 56 LD | 57 LD | 58 LD | 59 LD | 60 LD | 61 LD | 62 LD | 63 LD | 64 LD | 65 LD | 66 LD | 67 LD | 68 LD | 69 LD | 70 LD | 71 LD | 72 LD | 73 LD | 74 LD | 75 LD | 76 LD | 77 LD | 78 LD | 79 LD | 80 LD | 81 LD | 82 LD | 83 LD | 84 LD | 85 LD | 86 LD | 87 LD | 88 LD | 89 LD | 90 LD | 91 LD | 92 LD | 93 LD | 94 LD | 95 LD | 96 LD | 97 LD | 98 LD | 99 LD | 100 LD |
| light-day | 1.4840590893792 × 10-5 ly | 2.9681181787583 × 10-5 ly | 4.4521772681375 × 10-5 ly | 5.9362363575167 × 10-5 ly | 7.4202954468958 × 10-5 ly | 8.904354536275 × 10-5 ly | 0.0001039 ly | 0.0001187 ly | 0.0001336 ly | 0.0001484 ly | 0.0001632 ly | 0.0001781 ly | 0.0001929 ly | 0.0002078 ly | 0.0002226 ly | 0.0002374 ly | 0.0002523 ly | 0.0002671 ly | 0.0002820 ly | 0.0002968 ly | 0.0003117 ly | 0.0003265 ly | 0.0003413 ly | 0.0003562 ly | 0.0003710 ly | 0.0003859 ly | 0.0004007 ly | 0.0004155 ly | 0.0004304 ly | 0.0004452 ly | 0.0004601 ly | 0.0004749 ly | 0.0004897 ly | 0.0005046 ly | 0.0005194 ly | 0.0005343 ly | 0.0005491 ly | 0.0005639 ly | 0.0005788 ly | 0.0005936 ly | 0.0006085 ly | 0.0006233 ly | 0.0006381 ly | 0.0006530 ly | 0.0006678 ly | 0.0006827 ly | 0.0006975 ly | 0.0007123 ly | 0.0007272 ly | 0.0007420 ly | 0.0007569 ly | 0.0007717 ly | 0.0007866 ly | 0.0008014 ly | 0.0008162 ly | 0.0008311 ly | 0.0008459 ly | 0.0008608 ly | 0.0008756 ly | 0.0008904 ly | 0.0009053 ly | 0.0009201 ly | 0.0009350 ly | 0.0009498 ly | 0.0009646 ly | 0.0009795 ly | 0.0009943 ly | 0.0010092 ly | 0.0010240 ly | 0.0010388 ly | 0.0010537 ly | 0.0010685 ly | 0.0010834 ly | 0.0010982 ly | 0.0011130 ly | 0.0011279 ly | 0.0011427 ly | 0.0011576 ly | 0.0011724 ly | 0.0011872 ly | 0.0012021 ly | 0.0012169 ly | 0.0012318 ly | 0.0012466 ly | 0.0012615 ly | 0.0012763 ly | 0.0012911 ly | 0.0013060 ly | 0.0013208 ly | 0.0013357 ly | 0.0013505 ly | 0.0013653 ly | 0.0013802 ly | 0.0013950 ly | 0.0014099 ly | 0.0014247 ly | 0.0014395 ly | 0.0014544 ly | 0.0014692 ly | 0.0014841 ly |
Lunar distance (LD), also called Earth–Moon distance, Earth–Moon characteristic distance, or distance to the Moon, is as a unit of measure in astronomy. It is the average distance from the center of Earth to the center of the Moon.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| lunar distance | LD | ≈ 384402 km | ≈ 384 402 000 m | Science - Astronomy (Length) |
| lunar distance | light-days | lunar distance | light-days |
|---|---|---|---|
| 1 | ≈ 1.4840590893792E-5 | 4 | ≈ 5.9362363575167E-5 |
| 1.5 | ≈ 2.2260886340688E-5 | 4.5 | ≈ 6.6782659022063E-5 |
| 2 | ≈ 2.9681181787583E-5 | 5 | ≈ 7.4202954468958E-5 |
| 2.5 | ≈ 3.7101477234479E-5 | 5.5 | ≈ 8.1623249915854E-5 |
| 3 | ≈ 4.4521772681375E-5 | 6 | ≈ 8.904354536275E-5 |
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.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| light-day | ly | ≡ 24 light-hours | ≡ 2.59020683712×1013 m | Science - Astronomy (Length) |
| light-days | lunar distance | light-days | lunar distance |
|---|---|---|---|
| 1 | ≈ 67382.761721323 | 4 | ≈ 269531.04688529 |
| 1.5 | ≈ 101074.14258198 | 4.5 | ≈ 303222.42774595 |
| 2 | ≈ 134765.52344265 | 5 | ≈ 336913.80860661 |
| 2.5 | ≈ 168456.90430331 | 5.5 | ≈ 370605.18946728 |
| 3 | ≈ 202148.28516397 | 6 | ≈ 404296.57032794 |
| lunar distance | light-days |
|---|---|
| 1 | ≈ 1.4840590893792 × 10-5 |
| 67,382.7617213 | ≈ 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 …) |