| Values for Old Faithful Area | 1991-08-03 |
|---|---|
| Astronomical Twilight Begin | 04:10 |
| Nautical Twilight Begin | 04:57 |
| Civil Twilight Begin | 05:39 |
| Sunrise | 06:12 |
| Sunset | 20:46 |
| Civil Twilight End | 21:19 |
| Nautical Twilight End | 22:01 |
| Astronomical Twilight End | 22:48 |
| Moon Illumination | 52.59% |