| Values for Old Faithful Area | 1997-04-17 |
|---|---|
| Astronomical Twilight Begin | 04:47 |
| Nautical Twilight Begin | 05:27 |
| Civil Twilight Begin | 06:04 |
| Sunrise | 06:35 |
| Sunset | 20:10 |
| Civil Twilight End | 20:40 |
| Nautical Twilight End | 21:18 |
| Astronomical Twilight End | 21:57 |
| Moon Illumination | 73.17% |