| Geyser | 1981-08-17 |
|---|---|
| Collapsed Cave | 1800 |
| Morning | 1008 |
| Moxie | 1800 |
| Pequito | 1800 |
| Whirligig | 1510, 1622 |
| Values for Old Faithful Area | 1981-08-17 |
|---|---|
| Astronomical Twilight Begin | 04:37 |
| Nautical Twilight Begin | 05:19 |
| Civil Twilight Begin | 05:57 |
| Sunrise | 06:28 |
| Sunset | 20:25 |
| Civil Twilight End | 20:57 |
| Nautical Twilight End | 21:35 |
| Astronomical Twilight End | 22:17 |
| Moon Illumination | 97.06% |