| Values for Old Faithful Area | 1981-08-11 |
|---|---|
| Astronomical Twilight Begin | 04:26 |
| Nautical Twilight Begin | 05:10 |
| Civil Twilight Begin | 05:49 |
| Sunrise | 06:21 |
| Sunset | 20:35 |
| Civil Twilight End | 21:06 |
| Nautical Twilight End | 21:46 |
| Astronomical Twilight End | 22:30 |
| Moon Illumination | 80.54% |