| Values for Old Faithful Area | 1931-09-09 |
|---|---|
| Astronomical Twilight Begin | 04:13 |
| Nautical Twilight Begin | 04:49 |
| Civil Twilight Begin | 05:24 |
| Sunrise | 05:54 |
| Sunset | 18:47 |
| Civil Twilight End | 19:16 |
| Nautical Twilight End | 19:51 |
| Astronomical Twilight End | 20:28 |
| Moon Illumination | 11.91% |