| Geyser | 2000-02-04 |
|---|---|
| Grand | 0132 E, 1405 E |
| Great Fountain | 0626 E, 1533 E |
| Values for Old Faithful Area | 2000-02-04 |
|---|---|
| Astronomical Twilight Begin | 05:59 |
| Nautical Twilight Begin | 06:33 |
| Civil Twilight Begin | 07:07 |
| Sunrise | 07:38 |
| Sunset | 17:35 |
| Civil Twilight End | 18:06 |
| Nautical Twilight End | 18:41 |
| Astronomical Twilight End | 19:15 |
| Moon Illumination | 1.51% |