| Values for Old Faithful Area | 1931-08-19 |
|---|---|
| Astronomical Twilight Begin | 03:38 |
| Nautical Twilight Begin | 04:20 |
| Civil Twilight Begin | 04:58 |
| Sunrise | 05:29 |
| Sunset | 19:23 |
| Civil Twilight End | 19:55 |
| Nautical Twilight End | 20:33 |
| Astronomical Twilight End | 21:14 |
| Moon Illumination | 36.83% |