| Values for Old Faithful Area | 1977-04-24 |
|---|---|
| Astronomical Twilight Begin | 04:32 |
| Nautical Twilight Begin | 05:14 |
| Civil Twilight Begin | 05:52 |
| Sunrise | 06:23 |
| Sunset | 20:18 |
| Civil Twilight End | 20:50 |
| Nautical Twilight End | 21:28 |
| Astronomical Twilight End | 22:10 |
| Moon Illumination | 28.05% |