| Geyser | 1931-09-19 |
|---|---|
| Constant | 0000 |
| Dark Cavern | 0000 |
| Ebony | 1030 |
| Little Whirligig | 0000 |
| Minute | 0000 |
| Pinto | 1132 |
| Steamboat | 0000 |
| Vixen | 0000 |
| Values for Old Faithful Area | 1931-09-19 |
|---|---|
| Astronomical Twilight Begin | 04:27 |
| Nautical Twilight Begin | 05:02 |
| Civil Twilight Begin | 05:37 |
| Sunrise | 06:06 |
| Sunset | 18:28 |
| Civil Twilight End | 18:57 |
| Nautical Twilight End | 19:31 |
| Astronomical Twilight End | 20:07 |
| Moon Illumination | 54.58% |