| Values for Old Faithful Area | 1977-04-30 |
|---|---|
| Astronomical Twilight Begin | 04:19 |
| Nautical Twilight Begin | 05:03 |
| Civil Twilight Begin | 05:42 |
| Sunrise | 06:14 |
| Sunset | 20:26 |
| Civil Twilight End | 20:58 |
| Nautical Twilight End | 21:37 |
| Astronomical Twilight End | 22:21 |
| Moon Illumination | 85.13% |