| Values for Old Faithful Area | 1988-07-29 |
|---|---|
| Astronomical Twilight Begin | 04:02 |
| Nautical Twilight Begin | 04:51 |
| Civil Twilight Begin | 05:33 |
| Sunrise | 06:07 |
| Sunset | 20:51 |
| Civil Twilight End | 21:25 |
| Nautical Twilight End | 22:07 |
| Astronomical Twilight End | 22:57 |
| Moon Illumination | 99.99% |