| Values for Old Faithful Area | 1931-08-17 |
|---|---|
| Astronomical Twilight Begin | 03:35 |
| Nautical Twilight Begin | 04:17 |
| Civil Twilight Begin | 04:56 |
| Sunrise | 05:27 |
| Sunset | 19:27 |
| Civil Twilight End | 19:58 |
| Nautical Twilight End | 20:37 |
| Astronomical Twilight End | 21:19 |
| Moon Illumination | 16.46% |