| Geyser | 1999-05-06 |
|---|---|
| Castle | 0335 E, 1138 E |
| Great Fountain | 0518 E, 1638 E |
| Values for Old Faithful Area | 1999-05-06 |
|---|---|
| Astronomical Twilight Begin | 04:07 |
| Nautical Twilight Begin | 04:53 |
| Civil Twilight Begin | 05:34 |
| Sunrise | 06:06 |
| Sunset | 20:33 |
| Civil Twilight End | 21:05 |
| Nautical Twilight End | 21:46 |
| Astronomical Twilight End | 22:32 |
| Moon Illumination | 73.75% |