| Values for Old Faithful Area | 1971-07-23 |
|---|---|
| Astronomical Twilight Begin | 03:49 |
| Nautical Twilight Begin | 04:41 |
| Civil Twilight Begin | 05:25 |
| Sunrise | 06:00 |
| Sunset | 20:59 |
| Civil Twilight End | 21:33 |
| Nautical Twilight End | 22:17 |
| Astronomical Twilight End | 23:10 |
| Moon Illumination | 0.77% |