| Geyser | 1931-07-29 |
|---|---|
| Ebony | 1040 |
| Pinto | 0815 |
| Values for Old Faithful Area | 1931-07-29 |
|---|---|
| Astronomical Twilight Begin | 02:59 |
| Nautical Twilight Begin | 03:49 |
| Civil Twilight Begin | 04:32 |
| Sunrise | 05:06 |
| Sunset | 19:53 |
| Civil Twilight End | 20:26 |
| Nautical Twilight End | 21:09 |
| Astronomical Twilight End | 21:59 |
| Moon Illumination | 99.94% |