| Values for Old Faithful Area | 1975-04-20 |
|---|---|
| Astronomical Twilight Begin | 04:42 |
| Nautical Twilight Begin | 05:23 |
| Civil Twilight Begin | 06:00 |
| Sunrise | 06:31 |
| Sunset | 20:13 |
| Civil Twilight End | 20:44 |
| Nautical Twilight End | 21:21 |
| Astronomical Twilight End | 22:01 |
| Moon Illumination | 62.04% |