| Values for Old Faithful Area | 1998-04-17 |
|---|---|
| Astronomical Twilight Begin | 04:48 |
| Nautical Twilight Begin | 05:28 |
| Civil Twilight Begin | 06:05 |
| Sunrise | 06:35 |
| Sunset | 20:10 |
| Civil Twilight End | 20:40 |
| Nautical Twilight End | 21:17 |
| Astronomical Twilight End | 21:57 |
| Moon Illumination | 75.56% |