| Values for Old Faithful Area | 1997-04-15 |
|---|---|
| Astronomical Twilight Begin | 04:52 |
| Nautical Twilight Begin | 05:31 |
| Civil Twilight Begin | 06:08 |
| Sunrise | 06:38 |
| Sunset | 20:08 |
| Civil Twilight End | 20:38 |
| Nautical Twilight End | 21:15 |
| Astronomical Twilight End | 21:54 |
| Moon Illumination | 55.08% |