| Values for Old Faithful Area | 1971-09-18 |
|---|---|
| Astronomical Twilight Begin | 05:26 |
| Nautical Twilight Begin | 06:01 |
| Civil Twilight Begin | 06:36 |
| Sunrise | 07:05 |
| Sunset | 19:29 |
| Civil Twilight End | 19:58 |
| Nautical Twilight End | 20:33 |
| Astronomical Twilight End | 21:08 |
| Moon Illumination | 1.68% |