| Values for Old Faithful Area | 1973-04-01 |
|---|---|
| Astronomical Twilight Begin | 04:23 |
| Nautical Twilight Begin | 04:59 |
| Civil Twilight Begin | 05:34 |
| Sunrise | 06:03 |
| Sunset | 18:50 |
| Civil Twilight End | 19:19 |
| Nautical Twilight End | 19:54 |
| Astronomical Twilight End | 20:31 |
| Moon Illumination | 6.11% |