| Geyser | 1999-05-07 |
|---|---|
| Castle | 0317 E, 2350 E |
| Great Fountain | 0138 E, 0938 E, 2058 E |
| Values for Old Faithful Area | 1999-05-07 |
|---|---|
| Astronomical Twilight Begin | 04:05 |
| Nautical Twilight Begin | 04:51 |
| Civil Twilight Begin | 05:32 |
| Sunrise | 06:05 |
| Sunset | 20:34 |
| Civil Twilight End | 21:06 |
| Nautical Twilight End | 21:47 |
| Astronomical Twilight End | 22:34 |
| Moon Illumination | 64.7% |