| Values for Old Faithful Area | 1977-02-17 |
|---|---|
| Astronomical Twilight Begin | 05:42 |
| Nautical Twilight Begin | 06:16 |
| Civil Twilight Begin | 06:50 |
| Sunrise | 07:19 |
| Sunset | 17:54 |
| Civil Twilight End | 18:24 |
| Nautical Twilight End | 18:58 |
| Astronomical Twilight End | 19:32 |
| Moon Illumination | 0.87% |