| Values for Old Faithful Area | 1977-04-16 |
|---|---|
| Astronomical Twilight Begin | 03:50 |
| Nautical Twilight Begin | 04:29 |
| Civil Twilight Begin | 05:06 |
| Sunrise | 05:37 |
| Sunset | 19:09 |
| Civil Twilight End | 19:39 |
| Nautical Twilight End | 20:16 |
| Astronomical Twilight End | 20:55 |
| Moon Illumination | 4.39% |