| Values for Old Faithful Area | 1931-08-16 |
|---|---|
| Astronomical Twilight Begin | 03:33 |
| Nautical Twilight Begin | 04:16 |
| Civil Twilight Begin | 04:54 |
| Sunrise | 05:26 |
| Sunset | 19:28 |
| Civil Twilight End | 20:00 |
| Nautical Twilight End | 20:38 |
| Astronomical Twilight End | 21:21 |
| Moon Illumination | 8.55% |