| Values for Old Faithful Area | 1977-08-20 |
|---|---|
| Astronomical Twilight Begin | 04:42 |
| Nautical Twilight Begin | 05:23 |
| Civil Twilight Begin | 06:01 |
| Sunrise | 06:32 |
| Sunset | 20:20 |
| Civil Twilight End | 20:51 |
| Nautical Twilight End | 21:29 |
| Astronomical Twilight End | 22:10 |
| Moon Illumination | 30.27% |