| Geyser | 1961-06-28 |
|---|---|
| Bear Den | 1200 |
| Blue | 1200 |
| Colloidal Pool | 1200 |
| Constant | 1200 |
| Ebony | 1200 |
| Echinus | 1200 |
| Ledge | 1200 |
| Little Whirligig | 1200 |
| Pinwheel | 1200 |
| Steamboat | 1200 |
| Valentine | 1200 |
| Vixen | 1200 |
| Whirligig | 1200 |
| Values for Old Faithful Area | 1961-06-28 |
|---|---|
| Astronomical Twilight Begin | 02:13 |
| Nautical Twilight Begin | 03:15 |
| Civil Twilight Begin | 04:04 |
| Sunrise | 04:40 |
| Sunset | 20:12 |
| Civil Twilight End | 20:48 |
| Nautical Twilight End | 21:37 |
| Astronomical Twilight End | 22:39 |
| Moon Illumination | 99.91% |