| Values for Old Faithful Area | 1997-04-19 |
|---|---|
| Astronomical Twilight Begin | 04:43 |
| Nautical Twilight Begin | 05:23 |
| Civil Twilight Begin | 06:01 |
| Sunrise | 06:31 |
| Sunset | 20:12 |
| Civil Twilight End | 20:43 |
| Nautical Twilight End | 21:21 |
| Astronomical Twilight End | 22:01 |
| Moon Illumination | 87.96% |