| Values for Old Faithful Area | 1975-10-18 |
|---|---|
| Astronomical Twilight Begin | 06:05 |
| Nautical Twilight Begin | 06:38 |
| Civil Twilight Begin | 07:12 |
| Sunrise | 07:41 |
| Sunset | 18:35 |
| Civil Twilight End | 19:04 |
| Nautical Twilight End | 19:38 |
| Astronomical Twilight End | 20:11 |
| Moon Illumination | 96.48% |