| Geyser | 1966-08-05 |
|---|---|
| Cistern Spring | 1800 |
| Echinus | 0810, 0906, 1002, 1153, 1250, 1346, 1441, 1542, 1635 |
| Emerald Spring | 1800 |
| Ledge | 1123 |
| Steamboat | 0800-1500 |
| Valentine | 0945 |
| Values for Old Faithful Area | 1966-08-05 |
|---|---|
| Astronomical Twilight Begin | 04:14 |
| Nautical Twilight Begin | 05:00 |
| Civil Twilight Begin | 05:41 |
| Sunrise | 06:14 |
| Sunset | 20:44 |
| Civil Twilight End | 21:16 |
| Nautical Twilight End | 21:57 |
| Astronomical Twilight End | 22:44 |
| Moon Illumination | 86.82% |