| Geyser | 1999-02-06 |
|---|---|
| Great Fountain | 0548 E, 1538 E |
| Values for Old Faithful Area | 1999-02-06 |
|---|---|
| Astronomical Twilight Begin | 05:56 |
| Nautical Twilight Begin | 06:30 |
| Civil Twilight Begin | 07:05 |
| Sunrise | 07:35 |
| Sunset | 17:39 |
| Civil Twilight End | 18:09 |
| Nautical Twilight End | 18:44 |
| Astronomical Twilight End | 19:17 |
| Moon Illumination | 70.35% |