| Geyser | 1931-07-13 |
|---|---|
| Ebony | 1515 |
| Ledge | 1230 |
| Values for Old Faithful Area | 1931-07-13 |
|---|---|
| Astronomical Twilight Begin | 02:31 |
| Nautical Twilight Begin | 03:28 |
| Civil Twilight Begin | 04:14 |
| Sunrise | 04:50 |
| Sunset | 20:07 |
| Civil Twilight End | 20:42 |
| Nautical Twilight End | 21:29 |
| Astronomical Twilight End | 22:26 |
| Moon Illumination | 6.19% |