| Geyser | 1999-05-04 |
|---|---|
| Castle | 0359 E, 0914 E |
| Great Fountain | 0903 E, 2123 E |
| Values for Old Faithful Area | 1999-05-04 |
|---|---|
| Astronomical Twilight Begin | 04:11 |
| Nautical Twilight Begin | 04:56 |
| Civil Twilight Begin | 05:37 |
| Sunrise | 06:09 |
| Sunset | 20:30 |
| Civil Twilight End | 21:02 |
| Nautical Twilight End | 21:43 |
| Astronomical Twilight End | 22:28 |
| Moon Illumination | 88.53% |