| Values for Old Faithful Area | 1991-09-09 |
|---|---|
| Astronomical Twilight Begin | 05:13 |
| Nautical Twilight Begin | 05:50 |
| Civil Twilight Begin | 06:25 |
| Sunrise | 06:55 |
| Sunset | 19:46 |
| Civil Twilight End | 20:15 |
| Nautical Twilight End | 20:50 |
| Astronomical Twilight End | 21:27 |
| Moon Illumination | 0.86% |