| Values for Old Faithful Area | 1977-05-01 |
|---|---|
| Astronomical Twilight Begin | 04:17 |
| Nautical Twilight Begin | 05:01 |
| Civil Twilight Begin | 05:41 |
| Sunrise | 06:13 |
| Sunset | 20:27 |
| Civil Twilight End | 20:59 |
| Nautical Twilight End | 21:39 |
| Astronomical Twilight End | 22:23 |
| Moon Illumination | 92.4% |