| Geyser | 1976-04-21 |
|---|---|
| Castle | 1013 ie, 1918 |
| Values for Old Faithful Area | 1976-04-21 |
|---|---|
| Astronomical Twilight Begin | 03:38 |
| Nautical Twilight Begin | 04:19 |
| Civil Twilight Begin | 04:57 |
| Sunrise | 05:28 |
| Sunset | 19:15 |
| Civil Twilight End | 19:46 |
| Nautical Twilight End | 20:24 |
| Astronomical Twilight End | 21:05 |
| Moon Illumination | 50.17% |