| Geyser | 1999-11-23 |
|---|---|
| Grand | 0941 E, 1926 E |
| Great Fountain | 0814 E, 1744 E |
| Values for Old Faithful Area | 1999-11-23 |
|---|---|
| Astronomical Twilight Begin | 05:47 |
| Nautical Twilight Begin | 06:22 |
| Civil Twilight Begin | 06:57 |
| Sunrise | 07:29 |
| Sunset | 16:49 |
| Civil Twilight End | 17:21 |
| Nautical Twilight End | 17:57 |
| Astronomical Twilight End | 18:32 |
| Moon Illumination | 100% |