| Values for Old Faithful Area | 1991-08-06 |
|---|---|
| Astronomical Twilight Begin | 04:16 |
| Nautical Twilight Begin | 05:02 |
| Civil Twilight Begin | 05:43 |
| Sunrise | 06:15 |
| Sunset | 20:42 |
| Civil Twilight End | 21:15 |
| Nautical Twilight End | 21:56 |
| Astronomical Twilight End | 22:42 |
| Moon Illumination | 20.44% |