| Values for Old Faithful Area | 1981-09-11 |
|---|---|
| Astronomical Twilight Begin | 05:17 |
| Nautical Twilight Begin | 05:53 |
| Civil Twilight Begin | 06:28 |
| Sunrise | 06:57 |
| Sunset | 19:41 |
| Civil Twilight End | 20:11 |
| Nautical Twilight End | 20:45 |
| Astronomical Twilight End | 21:22 |
| Moon Illumination | 90.16% |