| Geyser | 1999-05-08 |
|---|---|
| Castle | 1523 E |
| Dark Cavern | 2000 |
| Great Fountain | 0928 E, 1938 E |
| Values for Old Faithful Area | 1999-05-08 |
|---|---|
| Astronomical Twilight Begin | 04:03 |
| Nautical Twilight Begin | 04:50 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:04 |
| Sunset | 20:35 |
| Civil Twilight End | 21:08 |
| Nautical Twilight End | 21:49 |
| Astronomical Twilight End | 22:36 |
| Moon Illumination | 54.87% |