| Values for Old Faithful Area | 1987-08-18 |
|---|---|
| Astronomical Twilight Begin | 04:38 |
| Nautical Twilight Begin | 05:19 |
| Civil Twilight Begin | 05:58 |
| Sunrise | 06:29 |
| Sunset | 20:24 |
| Civil Twilight End | 20:56 |
| Nautical Twilight End | 21:34 |
| Astronomical Twilight End | 22:16 |
| Moon Illumination | 31.72% |