| Values for Old Faithful Area | 1991-07-27 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:47 |
| Civil Twilight Begin | 05:30 |
| Sunrise | 06:04 |
| Sunset | 20:55 |
| Civil Twilight End | 21:28 |
| Nautical Twilight End | 22:11 |
| Astronomical Twilight End | 23:02 |
| Moon Illumination | 99.78% |