| Values for Old Faithful Area | 1981-08-15 |
|---|---|
| Astronomical Twilight Begin | 04:33 |
| Nautical Twilight Begin | 05:16 |
| Civil Twilight Begin | 05:54 |
| Sunrise | 06:26 |
| Sunset | 20:28 |
| Civil Twilight End | 21:00 |
| Nautical Twilight End | 21:39 |
| Astronomical Twilight End | 22:21 |
| Moon Illumination | 99.77% |