| Values for Old Faithful Area | 1975-04-23 |
|---|---|
| Astronomical Twilight Begin | 04:36 |
| Nautical Twilight Begin | 05:17 |
| Civil Twilight Begin | 05:55 |
| Sunrise | 06:26 |
| Sunset | 20:17 |
| Civil Twilight End | 20:48 |
| Nautical Twilight End | 21:26 |
| Astronomical Twilight End | 22:07 |
| Moon Illumination | 90.7% |