| Values for Old Faithful Area | 1976-07-17 |
|---|---|
| Astronomical Twilight Begin | 03:39 |
| Nautical Twilight Begin | 04:34 |
| Civil Twilight Begin | 05:20 |
| Sunrise | 05:55 |
| Sunset | 21:03 |
| Civil Twilight End | 21:38 |
| Nautical Twilight End | 22:24 |
| Astronomical Twilight End | 23:18 |
| Moon Illumination | 68.86% |