| Geyser | 1999-01-12 |
|---|---|
| Great Fountain | 0633 E, 1733 E |
| Values for Old Faithful Area | 1999-01-12 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:57 |
| Sunset | 17:05 |
| Civil Twilight End | 17:38 |
| Nautical Twilight End | 18:14 |
| Astronomical Twilight End | 18:49 |
| Moon Illumination | 25.71% |