| Geyser | 1966-08-15 |
|---|---|
| Cistern Spring | 0800 |
| Ebony | 1840 ie |
| Echinus | 0810, 0922, 1033, 1145, 1408, 1518, 1629 |
| Harding | 0800 |
| Ledge | 0630 A, 1545 min |
| Steamboat | 0800 |
| Valentine | 0700 A |
| Values for Old Faithful Area | 1966-08-15 |
|---|---|
| Astronomical Twilight Begin | 04:32 |
| Nautical Twilight Begin | 05:15 |
| Civil Twilight Begin | 05:54 |
| Sunrise | 06:25 |
| Sunset | 20:29 |
| Civil Twilight End | 21:01 |
| Nautical Twilight End | 21:39 |
| Astronomical Twilight End | 22:22 |
| Moon Illumination | 2.32% |