| Geyser | 1961-07-31 |
|---|---|
| Blue | 1200 |
| Colloidal Pool | 1200 |
| Constant | 1200 |
| Echinus | 1200 |
| Ledge | 1200 |
| Little Whirligig | 1200 |
| Pinwheel | 1200 |
| Valentine | 1200 |
| Values for Old Faithful Area | 1961-07-31 |
|---|---|
| Astronomical Twilight Begin | 03:05 |
| Nautical Twilight Begin | 03:53 |
| Civil Twilight Begin | 04:35 |
| Sunrise | 05:09 |
| Sunset | 19:50 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:53 |
| Moon Illumination | 82.99% |