| Values for Old Faithful Area | 1977-04-19 |
|---|---|
| Astronomical Twilight Begin | 03:43 |
| Nautical Twilight Begin | 04:23 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:32 |
| Sunset | 19:12 |
| Civil Twilight End | 19:43 |
| Nautical Twilight End | 20:20 |
| Astronomical Twilight End | 21:01 |
| Moon Illumination | 0.67% |