| Geyser | 1999-11-09 |
|---|---|
| Grand | 0056 E, 1350 E |
| Great Fountain | 0714 E, 1907 E |
| Values for Old Faithful Area | 1999-11-09 |
|---|---|
| Astronomical Twilight Begin | 05:31 |
| Nautical Twilight Begin | 06:05 |
| Civil Twilight Begin | 06:40 |
| Sunrise | 07:11 |
| Sunset | 17:02 |
| Civil Twilight End | 17:33 |
| Nautical Twilight End | 18:08 |
| Astronomical Twilight End | 18:42 |
| Moon Illumination | 1.17% |