| Geyser | 1931-07-19 |
|---|---|
| Ebony | 1125 |
| Pinto | 1025 |
| Values for Old Faithful Area | 1931-07-19 |
|---|---|
| Astronomical Twilight Begin | 02:41 |
| Nautical Twilight Begin | 03:35 |
| Civil Twilight Begin | 04:20 |
| Sunrise | 04:55 |
| Sunset | 20:03 |
| Civil Twilight End | 20:38 |
| Nautical Twilight End | 21:23 |
| Astronomical Twilight End | 22:17 |
| Moon Illumination | 18.6% |