| Values for Old Faithful Area | 1973-04-17 |
|---|---|
| Astronomical Twilight Begin | 03:48 |
| Nautical Twilight Begin | 04:27 |
| Civil Twilight Begin | 05:04 |
| Sunrise | 05:35 |
| Sunset | 19:10 |
| Civil Twilight End | 19:40 |
| Nautical Twilight End | 20:17 |
| Astronomical Twilight End | 20:57 |
| Moon Illumination | 99.92% |