| Values for Old Faithful Area | 1973-05-23 |
|---|---|
| Astronomical Twilight Begin | 03:34 |
| Nautical Twilight Begin | 04:28 |
| Civil Twilight Begin | 05:12 |
| Sunrise | 05:47 |
| Sunset | 20:52 |
| Civil Twilight End | 21:27 |
| Nautical Twilight End | 22:11 |
| Astronomical Twilight End | 23:05 |
| Moon Illumination | 70.3% |