| Geyser | 1999-04-24 |
|---|---|
| Castle | 0420 E, 2035 E |
| Great Fountain | 0528 E, 1703 E |
| Values for Old Faithful Area | 1999-04-24 |
|---|---|
| Astronomical Twilight Begin | 04:33 |
| Nautical Twilight Begin | 05:15 |
| Civil Twilight Begin | 05:53 |
| Sunrise | 06:24 |
| Sunset | 20:18 |
| Civil Twilight End | 20:49 |
| Nautical Twilight End | 21:27 |
| Astronomical Twilight End | 22:09 |
| Moon Illumination | 65.21% |