| Geyser | 1999-12-26 |
|---|---|
| Grand | 0653 E, 1756 E |
| Great Fountain | 0005 E, 1158 E, 2024 E |
| Values for Old Faithful Area | 1999-12-26 |
|---|---|
| Astronomical Twilight Begin | 06:12 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:58 |
| Sunset | 16:49 |
| Civil Twilight End | 17:22 |
| Nautical Twilight End | 17:59 |
| Astronomical Twilight End | 18:34 |
| Moon Illumination | 82.73% |