| Values for Old Faithful Area | 1981-08-09 |
|---|---|
| Astronomical Twilight Begin | 04:22 |
| Nautical Twilight Begin | 05:07 |
| Civil Twilight Begin | 05:47 |
| Sunrise | 06:19 |
| Sunset | 20:37 |
| Civil Twilight End | 21:10 |
| Nautical Twilight End | 21:50 |
| Astronomical Twilight End | 22:34 |
| Moon Illumination | 63.47% |