| Geyser | 1931-07-30 |
|---|---|
| Dark Cavern | 0950, 1545 |
| Pinto | 1930 |
| Values for Old Faithful Area | 1931-07-30 |
|---|---|
| Astronomical Twilight Begin | 03:01 |
| Nautical Twilight Begin | 03:51 |
| Civil Twilight Begin | 04:33 |
| Sunrise | 05:07 |
| Sunset | 19:52 |
| Civil Twilight End | 20:25 |
| Nautical Twilight End | 21:08 |
| Astronomical Twilight End | 21:57 |
| Moon Illumination | 99.44% |