| Values for Old Faithful Area | 1975-04-21 |
|---|---|
| Astronomical Twilight Begin | 04:40 |
| Nautical Twilight Begin | 05:21 |
| Civil Twilight Begin | 05:58 |
| Sunrise | 06:29 |
| Sunset | 20:14 |
| Civil Twilight End | 20:45 |
| Nautical Twilight End | 21:22 |
| Astronomical Twilight End | 22:03 |
| Moon Illumination | 72.88% |