| Values for Old Faithful Area | 1931-09-06 |
|---|---|
| Astronomical Twilight Begin | 04:08 |
| Nautical Twilight Begin | 04:45 |
| Civil Twilight Begin | 05:21 |
| Sunrise | 05:50 |
| Sunset | 18:52 |
| Civil Twilight End | 19:22 |
| Nautical Twilight End | 19:57 |
| Astronomical Twilight End | 20:35 |
| Moon Illumination | 39.88% |