| Values for Old Faithful Area | 1931-09-07 |
|---|---|
| Astronomical Twilight Begin | 04:10 |
| Nautical Twilight Begin | 04:47 |
| Civil Twilight Begin | 05:22 |
| Sunrise | 05:52 |
| Sunset | 18:50 |
| Civil Twilight End | 19:20 |
| Nautical Twilight End | 19:55 |
| Astronomical Twilight End | 20:32 |
| Moon Illumination | 29.78% |