| Values for Old Faithful Area | 1977-05-16 |
|---|---|
| Astronomical Twilight Begin | 03:46 |
| Nautical Twilight Begin | 04:37 |
| Civil Twilight Begin | 05:20 |
| Sunrise | 05:54 |
| Sunset | 20:44 |
| Civil Twilight End | 21:18 |
| Nautical Twilight End | 22:01 |
| Astronomical Twilight End | 22:52 |
| Moon Illumination | 3.13% |