| Values for Old Faithful Area | 1931-08-09 |
|---|---|
| Astronomical Twilight Begin | 03:20 |
| Nautical Twilight Begin | 04:05 |
| Civil Twilight Begin | 04:46 |
| Sunrise | 05:18 |
| Sunset | 19:39 |
| Civil Twilight End | 20:11 |
| Nautical Twilight End | 20:51 |
| Astronomical Twilight End | 21:36 |
| Moon Illumination | 24.83% |