| Geyser | 1966-06-21 |
|---|---|
| Blue | 0750 |
| Cistern Spring | 0800 |
| Echinus | 0836, 0951, 1104, 1445, 1600 |
| Ledge | 0755 ie |
| Steamboat | 0700 |
| Values for Old Faithful Area | 1966-06-21 |
|---|---|
| Astronomical Twilight Begin | 03:09 |
| Nautical Twilight Begin | 04:13 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:38 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:40 |
| Moon Illumination | 7.74% |