| Values for Old Faithful Area | 1977-08-23 |
|---|---|
| Astronomical Twilight Begin | 04:47 |
| Nautical Twilight Begin | 05:27 |
| Civil Twilight Begin | 06:05 |
| Sunrise | 06:35 |
| Sunset | 20:15 |
| Civil Twilight End | 20:46 |
| Nautical Twilight End | 21:23 |
| Astronomical Twilight End | 22:04 |
| Moon Illumination | 63.81% |