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Conversion Table for Units of
Astronomical Distances
| km | light seconds | light minutes | AU | light hours | light days | light months | light years | pc | |
| 1 km = | 1 | 3.3356⋅10-06 | 5.5594⋅10-08 | 6.6846⋅10-09 | 9.2657⋅10-10 | 3.8607⋅10-11 | 1.2869⋅10-12 | 1.0577⋅10-13 | 3.2408⋅10-14 |
| 1 light second = | 2.9979⋅1005 | 1 | 0.0167 | 2.0040⋅10-03 | 2.7778⋅10-04 | 1.1574⋅10-05 | 3.8580⋅10-07 | 3.1689⋅10-08 | 9.7156⋅10-09 |
| 1 light minute = | 1.7988⋅1007 | 60 | 1 | 0.1202 | 0.0167 | 6.9444⋅10-04 | 2.3148⋅10-05 | 1.9013⋅10-06 | 5.8294⋅10-07 |
| 1 AU = | 1.4960⋅1008 | 499.0 | 8.3167 | 1 | 0.1386 | 5.7755⋅10-03 | 1.9252⋅10-04 | 1.5823⋅10-05 | 4.8481⋅10-06 |
| 1 light hour = | 1.0793⋅1009 | 3,600 | 60 | 7.214 | 1 | 0.0417 | 1.3889⋅10-03 | 1.1408⋅10-04 | 3.4976⋅10-05 |
| 1 light day = | 2.5902⋅1010 | 86,400 | 1,440 | 173.14 | 24 | 1 | 0.0333 | 2.7379⋅10-03 | 8.3943⋅10-04 |
| 1 light month = | 7.7706⋅1011 | 2.5920⋅1006 | 43,200 | 5,194.34 | 720 | 30 | 1 | 0.0821 | 0.0252 |
| 1 light year = | 9.4605⋅1012 | 3.1557⋅1007 | 525,949 | 63,239.7 | 8,766 | 365.242198 | 12.175 | 1 | 0.3066 |
| 1 pc = | 3.0857⋅1013 | 1.0293⋅1008 | 1,715,452 | 206,265 | 28,590.9 | 1,191.3 | 39.710 | 3.2638 | 1 |
Remark: the light … units are based on the speed of light in vacuum, c = 299,792,458 m/s.
