| Geyser | 1981-08-22 |
|---|---|
| Morning | 0100, 1810 |
| Sunday | 1751, 1802:24, 1813:17, 1828:04, 1830:09, 1835, 1844:30, 1848:58, 1858:19, 1908:28, 1910, 1921:38, 1930 |
| Whirligig | 1952 |
| Values for Old Faithful Area | 1981-08-22 |
|---|---|
| Astronomical Twilight Begin | 04:45 |
| Nautical Twilight Begin | 05:26 |
| Civil Twilight Begin | 06:03 |
| Sunrise | 06:34 |
| Sunset | 20:17 |
| Civil Twilight End | 20:48 |
| Nautical Twilight End | 21:25 |
| Astronomical Twilight End | 22:06 |
| Moon Illumination | 54.12% |