| Values for Old Faithful Area | 1931-08-28 |
|---|---|
| Astronomical Twilight Begin | 03:54 |
| Nautical Twilight Begin | 04:33 |
| Civil Twilight Begin | 05:10 |
| Sunrise | 05:40 |
| Sunset | 19:08 |
| Civil Twilight End | 19:39 |
| Nautical Twilight End | 20:15 |
| Astronomical Twilight End | 20:54 |
| Moon Illumination | 99.98% |