| Values for Old Faithful Area | 1971-09-13 |
|---|---|
| Astronomical Twilight Begin | 05:19 |
| Nautical Twilight Begin | 05:55 |
| Civil Twilight Begin | 06:30 |
| Sunrise | 06:59 |
| Sunset | 19:39 |
| Civil Twilight End | 20:08 |
| Nautical Twilight End | 20:43 |
| Astronomical Twilight End | 21:19 |
| Moon Illumination | 34.61% |