| Geyser | 1999-10-22 |
|---|---|
| Grand | 0120 E, 1320 E |
| Great Fountain | 0134 E, 1026 E, 1851 E |
| Values for Old Faithful Area | 1999-10-22 |
|---|---|
| Astronomical Twilight Begin | 06:10 |
| Nautical Twilight Begin | 06:43 |
| Civil Twilight Begin | 07:17 |
| Sunrise | 07:47 |
| Sunset | 18:28 |
| Civil Twilight End | 18:57 |
| Nautical Twilight End | 19:31 |
| Astronomical Twilight End | 20:05 |
| Moon Illumination | 90.89% |