| Values for Old Faithful Area | 1988-08-01 |
|---|---|
| Astronomical Twilight Begin | 04:08 |
| Nautical Twilight Begin | 04:55 |
| Civil Twilight Begin | 05:37 |
| Sunrise | 06:10 |
| Sunset | 20:48 |
| Civil Twilight End | 21:21 |
| Nautical Twilight End | 22:03 |
| Astronomical Twilight End | 22:50 |
| Moon Illumination | 86.21% |