| Values for Old Faithful Area | 1997-04-13 |
|---|---|
| Astronomical Twilight Begin | 04:56 |
| Nautical Twilight Begin | 05:35 |
| Civil Twilight Begin | 06:11 |
| Sunrise | 06:41 |
| Sunset | 20:05 |
| Civil Twilight End | 20:35 |
| Nautical Twilight End | 21:12 |
| Astronomical Twilight End | 21:50 |
| Moon Illumination | 35.74% |