| Values for Old Faithful Area | 1991-09-16 |
|---|---|
| Astronomical Twilight Begin | 05:23 |
| Nautical Twilight Begin | 05:59 |
| Civil Twilight Begin | 06:34 |
| Sunrise | 07:03 |
| Sunset | 19:33 |
| Civil Twilight End | 20:02 |
| Nautical Twilight End | 20:36 |
| Astronomical Twilight End | 21:12 |
| Moon Illumination | 53.11% |