| Geyser | 1999-11-11 |
|---|---|
| Grand | 0520 E, 1838 E |
| Great Fountain | 0251 E, 1243 E, 2248 E |
| Values for Old Faithful Area | 1999-11-11 |
|---|---|
| Astronomical Twilight Begin | 05:33 |
| Nautical Twilight Begin | 06:08 |
| Civil Twilight Begin | 06:43 |
| Sunrise | 07:14 |
| Sunset | 17:00 |
| Civil Twilight End | 17:31 |
| Nautical Twilight End | 18:06 |
| Astronomical Twilight End | 18:40 |
| Moon Illumination | 8.65% |