| Values for Old Faithful Area | 1997-04-10 |
|---|---|
| Astronomical Twilight Begin | 05:03 |
| Nautical Twilight Begin | 05:41 |
| Civil Twilight Begin | 06:17 |
| Sunrise | 06:47 |
| Sunset | 20:01 |
| Civil Twilight End | 20:31 |
| Nautical Twilight End | 21:07 |
| Astronomical Twilight End | 21:45 |
| Moon Illumination | 10.19% |