| Values for Old Faithful Area | 1991-08-02 |
|---|---|
| Astronomical Twilight Begin | 04:08 |
| Nautical Twilight Begin | 04:56 |
| Civil Twilight Begin | 05:38 |
| Sunrise | 06:11 |
| Sunset | 20:48 |
| Civil Twilight End | 21:21 |
| Nautical Twilight End | 22:02 |
| Astronomical Twilight End | 22:50 |
| Moon Illumination | 63.23% |