| Values for Old Faithful Area | 1931-08-29 |
|---|---|
| Astronomical Twilight Begin | 03:55 |
| Nautical Twilight Begin | 04:34 |
| Civil Twilight Begin | 05:11 |
| Sunrise | 05:41 |
| Sunset | 19:07 |
| Civil Twilight End | 19:37 |
| Nautical Twilight End | 20:13 |
| Astronomical Twilight End | 20:52 |
| Moon Illumination | 98.79% |