| Values for Old Faithful Area | 1977-09-08 |
|---|---|
| Astronomical Twilight Begin | 05:12 |
| Nautical Twilight Begin | 05:49 |
| Civil Twilight Begin | 06:24 |
| Sunrise | 06:54 |
| Sunset | 19:47 |
| Civil Twilight End | 20:16 |
| Nautical Twilight End | 20:52 |
| Astronomical Twilight End | 21:28 |
| Moon Illumination | 25.8% |