| Geyser | 1999-04-25 |
|---|---|
| Castle | 1050 E, 1553 E |
| Great Fountain | 0318 E, 1458 E |
| Values for Old Faithful Area | 1999-04-25 |
|---|---|
| Astronomical Twilight Begin | 04:31 |
| Nautical Twilight Begin | 05:13 |
| Civil Twilight Begin | 05:51 |
| Sunrise | 06:22 |
| Sunset | 20:19 |
| Civil Twilight End | 20:50 |
| Nautical Twilight End | 21:29 |
| Astronomical Twilight End | 22:11 |
| Moon Illumination | 74.68% |