| Geyser | 1999-04-27 |
|---|---|
| Castle | 1359 E |
| Great Fountain | 0133 E, 1118 E, 2118 E |
| Values for Old Faithful Area | 1999-04-27 |
|---|---|
| Astronomical Twilight Begin | 04:26 |
| Nautical Twilight Begin | 05:09 |
| Civil Twilight Begin | 05:48 |
| Sunrise | 06:19 |
| Sunset | 20:22 |
| Civil Twilight End | 20:53 |
| Nautical Twilight End | 21:32 |
| Astronomical Twilight End | 22:15 |
| Moon Illumination | 89.72% |