| Values for Old Faithful Area | 1931-08-06 |
|---|---|
| Astronomical Twilight Begin | 03:15 |
| Nautical Twilight Begin | 04:01 |
| Civil Twilight Begin | 04:42 |
| Sunrise | 05:14 |
| Sunset | 19:43 |
| Civil Twilight End | 20:16 |
| Nautical Twilight End | 20:56 |
| Astronomical Twilight End | 21:43 |
| Moon Illumination | 53.76% |