| Values for Old Faithful Area | 1997-05-20 |
|---|---|
| Astronomical Twilight Begin | 03:39 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:50 |
| Sunset | 20:49 |
| Civil Twilight End | 21:23 |
| Nautical Twilight End | 22:07 |
| Astronomical Twilight End | 23:00 |
| Moon Illumination | 95.06% |