| Values for Old Faithful Area | 1976-05-31 |
|---|---|
| Astronomical Twilight Begin | 03:21 |
| Nautical Twilight Begin | 04:19 |
| Civil Twilight Begin | 05:06 |
| Sunrise | 05:41 |
| Sunset | 21:00 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:22 |
| Astronomical Twilight End | 23:19 |
| Moon Illumination | 4.75% |