| Values for Old Faithful Area | 1991-09-15 |
|---|---|
| Astronomical Twilight Begin | 05:22 |
| Nautical Twilight Begin | 05:58 |
| Civil Twilight Begin | 06:32 |
| Sunrise | 07:02 |
| Sunset | 19:35 |
| Civil Twilight End | 20:04 |
| Nautical Twilight End | 20:38 |
| Astronomical Twilight End | 21:14 |
| Moon Illumination | 43.57% |