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A lightyear is the distance that light travels in one year. Since there are various definitions for the length of a year, there are correspondingly slightly different values for a lightyear. One lightyear corresponds to about 9.461e15 m, 5.879e12 mi, or 63239.7 AU, or 0.3066 pc.
The parsec is a unit of length equivalent to around 20 trillion (20,000,000,000,000) miles, 31 trillion kilometres, or 206,264 times the distance from the earth to the sun.
A parsec is also equivalent to approximately 3.26 light years (the journey distance if you travelled at the speed of light for three years and three months).
| Lightyears | Parsecs |
|---|---|
| 0ly | 0.00pc |
| 1ly | 0.31pc |
| 2ly | 0.61pc |
| 3ly | 0.92pc |
| 4ly | 1.23pc |
| 5ly | 1.53pc |
| 6ly | 1.84pc |
| 7ly | 2.15pc |
| 8ly | 2.45pc |
| 9ly | 2.76pc |
| 10ly | 3.07pc |
| 11ly | 3.37pc |
| 12ly | 3.68pc |
| 13ly | 3.99pc |
| 14ly | 4.29pc |
| 15ly | 4.60pc |
| 16ly | 4.91pc |
| 17ly | 5.21pc |
| 18ly | 5.52pc |
| 19ly | 5.83pc |
| Lightyears | Parsecs |
|---|---|
| 20ly | 6.13pc |
| 21ly | 6.44pc |
| 22ly | 6.75pc |
| 23ly | 7.05pc |
| 24ly | 7.36pc |
| 25ly | 7.67pc |
| 26ly | 7.97pc |
| 27ly | 8.28pc |
| 28ly | 8.58pc |
| 29ly | 8.89pc |
| 30ly | 9.20pc |
| 31ly | 9.50pc |
| 32ly | 9.81pc |
| 33ly | 10.12pc |
| 34ly | 10.42pc |
| 35ly | 10.73pc |
| 36ly | 11.04pc |
| 37ly | 11.34pc |
| 38ly | 11.65pc |
| 39ly | 11.96pc |
| Lightyears | Parsecs |
|---|---|
| 40ly | 12.26pc |
| 41ly | 12.57pc |
| 42ly | 12.88pc |
| 43ly | 13.18pc |
| 44ly | 13.49pc |
| 45ly | 13.80pc |
| 46ly | 14.10pc |
| 47ly | 14.41pc |
| 48ly | 14.72pc |
| 49ly | 15.02pc |
| 50ly | 15.33pc |
| 51ly | 15.64pc |
| 52ly | 15.94pc |
| 53ly | 16.25pc |
| 54ly | 16.56pc |
| 55ly | 16.86pc |
| 56ly | 17.17pc |
| 57ly | 17.48pc |
| 58ly | 17.78pc |
| 59ly | 18.09pc |