| Values for Old Faithful Area | 1991-07-25 |
|---|---|
| Astronomical Twilight Begin | 03:53 |
| Nautical Twilight Begin | 04:44 |
| Civil Twilight Begin | 05:28 |
| Sunrise | 06:02 |
| Sunset | 20:57 |
| Civil Twilight End | 21:31 |
| Nautical Twilight End | 22:14 |
| Astronomical Twilight End | 23:06 |
| Moon Illumination | 97.92% |