| Geyser | 1981-09-13 |
|---|---|
| Whirligig | 1421 |
| Values for Old Faithful Area | 1981-09-13 |
|---|---|
| Astronomical Twilight Begin | 05:20 |
| Nautical Twilight Begin | 05:56 |
| Civil Twilight Begin | 06:30 |
| Sunrise | 07:00 |
| Sunset | 19:38 |
| Civil Twilight End | 20:07 |
| Nautical Twilight End | 20:41 |
| Astronomical Twilight End | 21:17 |
| Moon Illumination | 99% |