| Values for Old Faithful Area | 1975-09-17 |
|---|---|
| Astronomical Twilight Begin | 05:25 |
| Nautical Twilight Begin | 06:00 |
| Civil Twilight Begin | 06:35 |
| Sunrise | 07:04 |
| Sunset | 19:31 |
| Civil Twilight End | 20:00 |
| Nautical Twilight End | 20:35 |
| Astronomical Twilight End | 21:10 |
| Moon Illumination | 90.68% |