| Values for Old Faithful Area | 1991-05-04 |
|---|---|
| Astronomical Twilight Begin | 04:11 |
| Nautical Twilight Begin | 04:57 |
| Civil Twilight Begin | 05:37 |
| Sunrise | 06:09 |
| Sunset | 20:30 |
| Civil Twilight End | 21:02 |
| Nautical Twilight End | 21:43 |
| Astronomical Twilight End | 22:28 |
| Moon Illumination | 75.32% |