| Geyser | 1999-01-25 |
|---|---|
| Great Fountain | 0628 E, 1703 E |
| Values for Old Faithful Area | 1999-01-25 |
|---|---|
| Astronomical Twilight Begin | 06:07 |
| Nautical Twilight Begin | 06:42 |
| Civil Twilight Begin | 07:17 |
| Sunrise | 07:48 |
| Sunset | 17:22 |
| Civil Twilight End | 17:53 |
| Nautical Twilight End | 18:29 |
| Astronomical Twilight End | 19:03 |
| Moon Illumination | 55.68% |