| Values for Old Faithful Area | 1991-02-10 |
|---|---|
| Astronomical Twilight Begin | 05:52 |
| Nautical Twilight Begin | 06:26 |
| Civil Twilight Begin | 07:00 |
| Sunrise | 07:30 |
| Sunset | 17:44 |
| Civil Twilight End | 18:14 |
| Nautical Twilight End | 18:49 |
| Astronomical Twilight End | 19:22 |
| Moon Illumination | 17.8% |