| Geyser | 1941-07-10 |
|---|---|
| Little Whirligig | 1600 |
| Whirligig | 0600, 1000, 1600 |
| Values for Old Faithful Area | 1941-07-10 |
|---|---|
| Astronomical Twilight Begin | 02:27 |
| Nautical Twilight Begin | 03:25 |
| Civil Twilight Begin | 04:12 |
| Sunrise | 04:48 |
| Sunset | 20:08 |
| Civil Twilight End | 20:44 |
| Nautical Twilight End | 21:31 |
| Astronomical Twilight End | 22:29 |
| Moon Illumination | 97.3% |