| Geyser | 1999-04-22 |
|---|---|
| Castle | 1135 E |
| Great Fountain | 0258 E, 1453 E |
| Values for Old Faithful Area | 1999-04-22 |
|---|---|
| Astronomical Twilight Begin | 04:37 |
| Nautical Twilight Begin | 05:18 |
| Civil Twilight Begin | 05:56 |
| Sunrise | 06:27 |
| Sunset | 20:16 |
| Civil Twilight End | 20:46 |
| Nautical Twilight End | 21:24 |
| Astronomical Twilight End | 22:05 |
| Moon Illumination | 43.96% |