| Values for Old Faithful Area | 1977-05-17 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:35 |
| Civil Twilight Begin | 05:19 |
| Sunrise | 05:53 |
| Sunset | 20:46 |
| Civil Twilight End | 21:20 |
| Nautical Twilight End | 22:03 |
| Astronomical Twilight End | 22:54 |
| Moon Illumination | 0.67% |