| Values for Old Faithful Area | 1977-08-12 |
|---|---|
| Astronomical Twilight Begin | 04:28 |
| Nautical Twilight Begin | 05:11 |
| Civil Twilight Begin | 05:51 |
| Sunrise | 06:22 |
| Sunset | 20:33 |
| Civil Twilight End | 21:05 |
| Nautical Twilight End | 21:44 |
| Astronomical Twilight End | 22:28 |
| Moon Illumination | 7.09% |