| Values for Old Faithful Area | 1987-03-15 |
|---|---|
| Astronomical Twilight Begin | 04:58 |
| Nautical Twilight Begin | 05:33 |
| Civil Twilight Begin | 06:06 |
| Sunrise | 06:35 |
| Sunset | 18:28 |
| Civil Twilight End | 18:57 |
| Nautical Twilight End | 19:31 |
| Astronomical Twilight End | 20:05 |
| Moon Illumination | 99.92% |