| Values for Old Faithful Area | 1931-08-10 |
|---|---|
| Astronomical Twilight Begin | 03:22 |
| Nautical Twilight Begin | 04:07 |
| Civil Twilight Begin | 04:47 |
| Sunrise | 05:19 |
| Sunset | 19:37 |
| Civil Twilight End | 20:09 |
| Nautical Twilight End | 20:49 |
| Astronomical Twilight End | 21:34 |
| Moon Illumination | 16.22% |