| Values for Old Faithful Area | 1931-09-15 |
|---|---|
| Astronomical Twilight Begin | 04:21 |
| Nautical Twilight Begin | 04:57 |
| Civil Twilight Begin | 05:32 |
| Sunrise | 06:01 |
| Sunset | 18:35 |
| Civil Twilight End | 19:05 |
| Nautical Twilight End | 19:39 |
| Astronomical Twilight End | 20:15 |
| Moon Illumination | 13.9% |