| Geyser | 1981-08-19 |
|---|---|
| Echinus | 0932, 1028, 1123, 1218, 1312 |
| Hurricane Vent | 1020 |
| Little Whirligig | 1215, 1455:53 |
| Morning | 0804 ie, 1952 |
| Values for Old Faithful Area | 1981-08-19 |
|---|---|
| Astronomical Twilight Begin | 04:40 |
| Nautical Twilight Begin | 05:22 |
| Civil Twilight Begin | 06:00 |
| Sunrise | 06:31 |
| Sunset | 20:22 |
| Civil Twilight End | 20:53 |
| Nautical Twilight End | 21:31 |
| Astronomical Twilight End | 22:13 |
| Moon Illumination | 84.87% |