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Unit of length equal to 66 feet, used especially in the U.S. public land surveys. The original measuring instrument (Gunter's chain) was literally a chain consisting of 100 iron links, each 7.92 inches long. Steel-ribbon tapes began to supersede chains around 1900, but surveying tapes are often still called "chains" and measuring with a tape is often called "chaining". The chain is a convenient unit in cadastral surveys because 10 square chains equal 1 acre.
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.
| -20.000ch | -4.2527e-14ly |
| -19.000ch | -4.0401e-14ly |
| -18.000ch | -3.8274e-14ly |
| -17.000ch | -3.6148e-14ly |
| -16.000ch | -3.4022e-14ly |
| -15.000ch | -3.1895e-14ly |
| -14.000ch | -2.9769e-14ly |
| -13.000ch | -2.7643e-14ly |
| -12.000ch | -2.5516e-14ly |
| -11.000ch | -2.3390e-14ly |
| -10.000ch | -2.1264e-14ly |
| -9.0000ch | -1.9137e-14ly |
| -8.0000ch | -1.7011e-14ly |
| -7.0000ch | -1.4884e-14ly |
| -6.0000ch | -1.2758e-14ly |
| -5.0000ch | -1.0632e-14ly |
| -4.0000ch | -8.5054e-15ly |
| -3.0000ch | -6.3791e-15ly |
| -2.0000ch | -4.2527e-15ly |
| -1.0000ch | -2.1264e-15ly |
| Chains | Lightyears |
|---|---|
| 0.0000ch | 0.0000ly |
| 1.0000ch | 2.1264e-15ly |
| 2.0000ch | 4.2527e-15ly |
| 3.0000ch | 6.3791e-15ly |
| 4.0000ch | 8.5054e-15ly |
| 5.0000ch | 1.0632e-14ly |
| 6.0000ch | 1.2758e-14ly |
| 7.0000ch | 1.4884e-14ly |
| 8.0000ch | 1.7011e-14ly |
| 9.0000ch | 1.9137e-14ly |
| 10.000ch | 2.1264e-14ly |
| 11.000ch | 2.3390e-14ly |
| 12.000ch | 2.5516e-14ly |
| 13.000ch | 2.7643e-14ly |
| 14.000ch | 2.9769e-14ly |
| 15.000ch | 3.1895e-14ly |
| 16.000ch | 3.4022e-14ly |
| 17.000ch | 3.6148e-14ly |
| 18.000ch | 3.8274e-14ly |
| 19.000ch | 4.0401e-14ly |
| Chains | Lightyears |
|---|---|
| 20.000ch | 4.2527e-14ly |
| 21.000ch | 4.4653e-14ly |
| 22.000ch | 4.6780e-14ly |
| 23.000ch | 4.8906e-14ly |
| 24.000ch | 5.1032e-14ly |
| 25.000ch | 5.3159e-14ly |
| 26.000ch | 5.5285e-14ly |
| 27.000ch | 5.7411e-14ly |
| 28.000ch | 5.9538e-14ly |
| 29.000ch | 6.1664e-14ly |
| 30.000ch | 6.3791e-14ly |
| 31.000ch | 6.5917e-14ly |
| 32.000ch | 6.8043e-14ly |
| 33.000ch | 7.0170e-14ly |
| 34.000ch | 7.2296e-14ly |
| 35.000ch | 7.4422e-14ly |
| 36.000ch | 7.6549e-14ly |
| 37.000ch | 7.8675e-14ly |
| 38.000ch | 8.0801e-14ly |
| 39.000ch | 8.2928e-14ly |
| Chains | Lightyears |
|---|---|
| 40.000ch | 8.5054e-14ly |
| 41.000ch | 8.7180e-14ly |
| 42.000ch | 8.9307e-14ly |
| 43.000ch | 9.1433e-14ly |
| 44.000ch | 9.3559e-14ly |
| 45.000ch | 9.5686e-14ly |
| 46.000ch | 9.7812e-14ly |
| 47.000ch | 9.9939e-14ly |
| 48.000ch | 1.0206e-13ly |
| 49.000ch | 1.0419e-13ly |
| 50.000ch | 1.0632e-13ly |
| 51.000ch | 1.0844e-13ly |
| 52.000ch | 1.1057e-13ly |
| 53.000ch | 1.1270e-13ly |
| 54.000ch | 1.1482e-13ly |
| 55.000ch | 1.1695e-13ly |
| 56.000ch | 1.1908e-13ly |
| 57.000ch | 1.2120e-13ly |
| 58.000ch | 1.2333e-13ly |
| 59.000ch | 1.2545e-13ly |
| 60.000ch | 1.2758e-13ly |
| 61.000ch | 1.2971e-13ly |
| 62.000ch | 1.3183e-13ly |
| 63.000ch | 1.3396e-13ly |
| 64.000ch | 1.3609e-13ly |
| 65.000ch | 1.3821e-13ly |
| 66.000ch | 1.4034e-13ly |
| 67.000ch | 1.4247e-13ly |
| 68.000ch | 1.4459e-13ly |
| 69.000ch | 1.4672e-13ly |
| 70.000ch | 1.4884e-13ly |
| 71.000ch | 1.5097e-13ly |
| 72.000ch | 1.5310e-13ly |
| 73.000ch | 1.5522e-13ly |
| 74.000ch | 1.5735e-13ly |
| 75.000ch | 1.5948e-13ly |
| 76.000ch | 1.6160e-13ly |
| 77.000ch | 1.6373e-13ly |
| 78.000ch | 1.6586e-13ly |
| 79.000ch | 1.6798e-13ly |