| Values for Old Faithful Area | 1991-08-07 |
|---|---|
| Astronomical Twilight Begin | 04:18 |
| Nautical Twilight Begin | 05:03 |
| Civil Twilight Begin | 05:44 |
| Sunrise | 06:16 |
| Sunset | 20:41 |
| Civil Twilight End | 21:13 |
| Nautical Twilight End | 21:54 |
| Astronomical Twilight End | 22:40 |
| Moon Illumination | 11.7% |