| Values for Old Faithful Area | 1931-07-27 |
|---|---|
| Astronomical Twilight Begin | 02:56 |
| Nautical Twilight Begin | 03:46 |
| Civil Twilight Begin | 04:29 |
| Sunrise | 05:03 |
| Sunset | 19:55 |
| Civil Twilight End | 20:29 |
| Nautical Twilight End | 21:12 |
| Astronomical Twilight End | 22:03 |
| Moon Illumination | 94.76% |