| Geyser | 1973-04-11 |
|---|---|
| Corporal | 1500 |
| Echinus | 1212-1237, 1237 |
| Pearl | 1500 |
| Veteran | 1220-1523, 1222, 1258, 1410, 1430, 1437, 1444, 1451, 1458, 1505 |
| Values for Old Faithful Area | 1973-04-11 |
|---|---|
| Astronomical Twilight Begin | 04:01 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:45 |
| Sunset | 19:02 |
| Civil Twilight End | 19:32 |
| Nautical Twilight End | 20:08 |
| Astronomical Twilight End | 20:47 |
| Moon Illumination | 62.27% |