| Values for Old Faithful Area | 1991-06-10 |
|---|---|
| Astronomical Twilight Begin | 03:12 |
| Nautical Twilight Begin | 04:13 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:38 |
| Sunset | 21:06 |
| Civil Twilight End | 21:43 |
| Nautical Twilight End | 22:31 |
| Astronomical Twilight End | 23:32 |
| Moon Illumination | 7.52% |