| Values for Old Faithful Area | 1977-08-30 |
|---|---|
| Astronomical Twilight Begin | 04:59 |
| Nautical Twilight Begin | 05:37 |
| Civil Twilight Begin | 06:13 |
| Sunrise | 06:43 |
| Sunset | 20:03 |
| Civil Twilight End | 20:33 |
| Nautical Twilight End | 21:10 |
| Astronomical Twilight End | 21:48 |
| Moon Illumination | 97.65% |