| Values for Old Faithful Area | 1931-09-16 |
|---|---|
| Astronomical Twilight Begin | 04:23 |
| Nautical Twilight Begin | 04:58 |
| Civil Twilight Begin | 05:33 |
| Sunrise | 06:02 |
| Sunset | 18:34 |
| Civil Twilight End | 19:03 |
| Nautical Twilight End | 19:37 |
| Astronomical Twilight End | 20:13 |
| Moon Illumination | 22.99% |