| Geyser | 1981-07-09 |
|---|---|
| Echinus | 1115, 1212 |
| Hurricane Vent | 1200 |
| Sunday | 1200 |
| Whirligig | 0916 |
| Values for Old Faithful Area | 1981-07-09 |
|---|---|
| Astronomical Twilight Begin | 03:26 |
| Nautical Twilight Begin | 04:25 |
| Civil Twilight Begin | 05:12 |
| Sunrise | 05:47 |
| Sunset | 21:09 |
| Civil Twilight End | 21:44 |
| Nautical Twilight End | 22:31 |
| Astronomical Twilight End | 23:30 |
| Moon Illumination | 51.36% |