| Values for Old Faithful Area | 1973-04-18 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:25 |
| Civil Twilight Begin | 05:03 |
| Sunrise | 05:33 |
| Sunset | 19:11 |
| Civil Twilight End | 19:42 |
| Nautical Twilight End | 20:19 |
| Astronomical Twilight End | 20:59 |
| Moon Illumination | 99.5% |