| Geyser | 1997-12-01 |
|---|---|
| Castle | 0915 E, 2055 E |
| Values for Old Faithful Area | 1997-12-01 |
|---|---|
| Astronomical Twilight Begin | 05:55 |
| Nautical Twilight Begin | 06:30 |
| Civil Twilight Begin | 07:07 |
| Sunrise | 07:39 |
| Sunset | 16:45 |
| Civil Twilight End | 17:17 |
| Nautical Twilight End | 17:54 |
| Astronomical Twilight End | 18:29 |
| Moon Illumination | 1.55% |