| Geyser | 1931-07-28 |
|---|---|
| Pinto | 1510 |
| Values for Old Faithful Area | 1931-07-28 |
|---|---|
| Astronomical Twilight Begin | 02:58 |
| Nautical Twilight Begin | 03:48 |
| Civil Twilight Begin | 04:31 |
| Sunrise | 05:04 |
| Sunset | 19:54 |
| Civil Twilight End | 20:28 |
| Nautical Twilight End | 21:11 |
| Astronomical Twilight End | 22:01 |
| Moon Illumination | 98.39% |