| Values for Old Faithful Area | 1931-08-30 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:36 |
| Civil Twilight Begin | 05:12 |
| Sunrise | 05:42 |
| Sunset | 19:05 |
| Civil Twilight End | 19:35 |
| Nautical Twilight End | 20:11 |
| Astronomical Twilight End | 20:50 |
| Moon Illumination | 95.82% |