| Geyser | 1999-01-10 |
|---|---|
| Great Fountain | 1103 E, 2038 E |
| Values for Old Faithful Area | 1999-01-10 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:58 |
| Sunset | 17:03 |
| Civil Twilight End | 17:35 |
| Nautical Twilight End | 18:12 |
| Astronomical Twilight End | 18:47 |
| Moon Illumination | 43.51% |