| Values for Old Faithful Area | 1976-04-01 |
|---|---|
| Astronomical Twilight Begin | 04:22 |
| Nautical Twilight Begin | 04:58 |
| Civil Twilight Begin | 05:33 |
| Sunrise | 06:03 |
| Sunset | 18:50 |
| Civil Twilight End | 19:20 |
| Nautical Twilight End | 19:55 |
| Astronomical Twilight End | 20:31 |
| Moon Illumination | 2.2% |