| Geyser | 1999-05-13 |
|---|---|
| Castle | 0920 E, 1711 E |
| Great Fountain | 0558 E, 1633 E |
| Values for Old Faithful Area | 1999-05-13 |
|---|---|
| Astronomical Twilight Begin | 03:53 |
| Nautical Twilight Begin | 04:42 |
| Civil Twilight Begin | 05:24 |
| Sunrise | 05:58 |
| Sunset | 20:41 |
| Civil Twilight End | 21:14 |
| Nautical Twilight End | 21:56 |
| Astronomical Twilight End | 22:45 |
| Moon Illumination | 7.59% |