| Geyser | 1999-02-03 |
|---|---|
| Great Fountain | 0918 E, 2148 E |
| Values for Old Faithful Area | 1999-02-03 |
|---|---|
| Astronomical Twilight Begin | 06:00 |
| Nautical Twilight Begin | 06:34 |
| Civil Twilight Begin | 07:08 |
| Sunrise | 07:39 |
| Sunset | 17:34 |
| Civil Twilight End | 18:05 |
| Nautical Twilight End | 18:40 |
| Astronomical Twilight End | 19:14 |
| Moon Illumination | 92.4% |