| Values for Old Faithful Area | 1977-08-19 |
|---|---|
| Astronomical Twilight Begin | 04:40 |
| Nautical Twilight Begin | 05:21 |
| Civil Twilight Begin | 06:00 |
| Sunrise | 06:31 |
| Sunset | 20:22 |
| Civil Twilight End | 20:53 |
| Nautical Twilight End | 21:31 |
| Astronomical Twilight End | 22:13 |
| Moon Illumination | 20.53% |