| Geyser | 1981-07-08 |
|---|---|
| Dark Cavern | 1435 |
| Whirligig | 1435 |
| Values for Old Faithful Area | 1981-07-08 |
|---|---|
| Astronomical Twilight Begin | 03:25 |
| Nautical Twilight Begin | 04:24 |
| Civil Twilight Begin | 05:11 |
| Sunrise | 05:47 |
| Sunset | 21:09 |
| Civil Twilight End | 21:45 |
| Nautical Twilight End | 22:32 |
| Astronomical Twilight End | 23:31 |
| Moon Illumination | 41.68% |