| Values for Old Faithful Area | 1977-04-29 |
|---|---|
| Astronomical Twilight Begin | 04:21 |
| Nautical Twilight Begin | 05:05 |
| Civil Twilight Begin | 05:44 |
| Sunrise | 06:16 |
| Sunset | 20:24 |
| Civil Twilight End | 20:56 |
| Nautical Twilight End | 21:35 |
| Astronomical Twilight End | 22:19 |
| Moon Illumination | 76.32% |