| Values for Old Faithful Area | 1977-08-29 |
|---|---|
| Astronomical Twilight Begin | 04:57 |
| Nautical Twilight Begin | 05:36 |
| Civil Twilight Begin | 06:12 |
| Sunrise | 06:42 |
| Sunset | 20:05 |
| Civil Twilight End | 20:35 |
| Nautical Twilight End | 21:12 |
| Astronomical Twilight End | 21:50 |
| Moon Illumination | 99.8% |