| Values for Old Faithful Area | 1971-09-23 |
|---|---|
| Astronomical Twilight Begin | 05:33 |
| Nautical Twilight Begin | 06:08 |
| Civil Twilight Begin | 06:42 |
| Sunrise | 07:11 |
| Sunset | 19:20 |
| Civil Twilight End | 19:49 |
| Nautical Twilight End | 20:23 |
| Astronomical Twilight End | 20:58 |
| Moon Illumination | 11.54% |