| Geyser | 1999-04-28 |
|---|---|
| Castle | 0411 E, 1820 E |
| Great Fountain | 0758 E, 1943 E |
| Values for Old Faithful Area | 1999-04-28 |
|---|---|
| Astronomical Twilight Begin | 04:24 |
| Nautical Twilight Begin | 05:07 |
| Civil Twilight Begin | 05:46 |
| Sunrise | 06:18 |
| Sunset | 20:23 |
| Civil Twilight End | 20:54 |
| Nautical Twilight End | 21:33 |
| Astronomical Twilight End | 22:16 |
| Moon Illumination | 94.88% |