| Values for Old Faithful Area | 1931-09-08 |
|---|---|
| Astronomical Twilight Begin | 04:11 |
| Nautical Twilight Begin | 04:48 |
| Civil Twilight Begin | 05:23 |
| Sunrise | 05:53 |
| Sunset | 18:49 |
| Civil Twilight End | 19:18 |
| Nautical Twilight End | 19:53 |
| Astronomical Twilight End | 20:30 |
| Moon Illumination | 20.26% |