| Values for Old Faithful Area | 1975-04-13 |
|---|---|
| Astronomical Twilight Begin | 04:58 |
| Nautical Twilight Begin | 05:36 |
| Civil Twilight Begin | 06:13 |
| Sunrise | 06:43 |
| Sunset | 20:04 |
| Civil Twilight End | 20:34 |
| Nautical Twilight End | 21:11 |
| Astronomical Twilight End | 21:49 |
| Moon Illumination | 2.35% |