| Geyser | 1931-08-11 |
|---|---|
| Ebony | 1520 |
| Pinto | 1630 |
| Values for Old Faithful Area | 1931-08-11 |
|---|---|
| Astronomical Twilight Begin | 03:24 |
| Nautical Twilight Begin | 04:08 |
| Civil Twilight Begin | 04:48 |
| Sunrise | 05:20 |
| Sunset | 19:36 |
| Civil Twilight End | 20:08 |
| Nautical Twilight End | 20:48 |
| Astronomical Twilight End | 21:32 |
| Moon Illumination | 8.92% |