| Geyser | 1939-08-31 |
|---|---|
| Colloidal Pool | 1200 |
| Values for Old Faithful Area | 1939-08-31 |
|---|---|
| Astronomical Twilight Begin | 03:59 |
| Nautical Twilight Begin | 04:37 |
| Civil Twilight Begin | 05:14 |
| Sunrise | 05:44 |
| Sunset | 19:03 |
| Civil Twilight End | 19:33 |
| Nautical Twilight End | 20:09 |
| Astronomical Twilight End | 20:48 |
| Moon Illumination | 98.33% |