| Values for Old Faithful Area | 1997-04-18 |
|---|---|
| Astronomical Twilight Begin | 04:45 |
| Nautical Twilight Begin | 05:25 |
| Civil Twilight Begin | 06:02 |
| Sunrise | 06:33 |
| Sunset | 20:11 |
| Civil Twilight End | 20:42 |
| Nautical Twilight End | 21:19 |
| Astronomical Twilight End | 21:59 |
| Moon Illumination | 81.1% |