| Geyser | 1981-09-08 |
|---|---|
| Echinus | 0950, 1246 |
| Graceful | 1042:56, 1138:20, 1511:44, 1607:18 ? |
| Whirligig | 1037:18, 1127:53 |
| Values for Old Faithful Area | 1981-09-08 |
|---|---|
| Astronomical Twilight Begin | 05:12 |
| Nautical Twilight Begin | 05:49 |
| Civil Twilight Begin | 06:24 |
| Sunrise | 06:54 |
| Sunset | 19:47 |
| Civil Twilight End | 20:16 |
| Nautical Twilight End | 20:51 |
| Astronomical Twilight End | 21:28 |
| Moon Illumination | 65.95% |