| Geyser | 1981-09-12 |
|---|---|
| Whirligig | 1250:30 |
| Values for Old Faithful Area | 1981-09-12 |
|---|---|
| Astronomical Twilight Begin | 05:18 |
| Nautical Twilight Begin | 05:54 |
| Civil Twilight Begin | 06:29 |
| Sunrise | 06:59 |
| Sunset | 19:39 |
| Civil Twilight End | 20:09 |
| Nautical Twilight End | 20:43 |
| Astronomical Twilight End | 21:20 |
| Moon Illumination | 95.6% |