| Values for Old Faithful Area | 1971-08-23 |
|---|---|
| Astronomical Twilight Begin | 04:46 |
| Nautical Twilight Begin | 05:26 |
| Civil Twilight Begin | 06:04 |
| Sunrise | 06:35 |
| Sunset | 20:16 |
| Civil Twilight End | 20:47 |
| Nautical Twilight End | 21:25 |
| Astronomical Twilight End | 22:05 |
| Moon Illumination | 4.9% |