| Geyser | 2000-02-01 |
|---|---|
| Grand | 0650 E, 1944 E |
| Great Fountain | 0840 E, 1816 E |
| Values for Old Faithful Area | 2000-02-01 |
|---|---|
| Astronomical Twilight Begin | 06:02 |
| Nautical Twilight Begin | 06:36 |
| Civil Twilight Begin | 07:11 |
| Sunrise | 07:42 |
| Sunset | 17:31 |
| Civil Twilight End | 18:02 |
| Nautical Twilight End | 18:37 |
| Astronomical Twilight End | 19:11 |
| Moon Illumination | 15.9% |