| Geyser | 1941-07-31 |
|---|---|
| Colloidal Pool | 1200 |
| Values for Old Faithful Area | 1941-07-31 |
|---|---|
| Astronomical Twilight Begin | 03:04 |
| Nautical Twilight Begin | 03:53 |
| Civil Twilight Begin | 04:35 |
| Sunrise | 05:08 |
| Sunset | 19:50 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:54 |
| Moon Illumination | 49% |