| Values for Old Faithful Area | 1931-09-10 |
|---|---|
| Astronomical Twilight Begin | 04:14 |
| Nautical Twilight Begin | 04:51 |
| Civil Twilight Begin | 05:26 |
| Sunrise | 05:55 |
| Sunset | 18:45 |
| Civil Twilight End | 19:14 |
| Nautical Twilight End | 19:49 |
| Astronomical Twilight End | 20:26 |
| Moon Illumination | 5.36% |