| Values for Old Faithful Area | 1977-04-25 |
|---|---|
| Astronomical Twilight Begin | 04:30 |
| Nautical Twilight Begin | 05:12 |
| Civil Twilight Begin | 05:51 |
| Sunrise | 06:22 |
| Sunset | 20:20 |
| Civil Twilight End | 20:51 |
| Nautical Twilight End | 21:29 |
| Astronomical Twilight End | 22:11 |
| Moon Illumination | 36.7% |