| Geyser | 1931-08-27 |
|---|---|
| Ebony | 1235 |
| Pinto | 1700 |
| Values for Old Faithful Area | 1931-08-27 |
|---|---|
| Astronomical Twilight Begin | 03:52 |
| Nautical Twilight Begin | 04:32 |
| Civil Twilight Begin | 05:08 |
| Sunrise | 05:39 |
| Sunset | 19:10 |
| Civil Twilight End | 19:40 |
| Nautical Twilight End | 20:17 |
| Astronomical Twilight End | 20:57 |
| Moon Illumination | 99.32% |