| Values for Old Faithful Area | 1991-09-11 |
|---|---|
| Astronomical Twilight Begin | 05:16 |
| Nautical Twilight Begin | 05:53 |
| Civil Twilight Begin | 06:28 |
| Sunrise | 06:57 |
| Sunset | 19:42 |
| Civil Twilight End | 20:11 |
| Nautical Twilight End | 20:46 |
| Astronomical Twilight End | 21:23 |
| Moon Illumination | 9.65% |