| Geyser | 1966-07-27 |
|---|---|
| Basin | 0900 |
| Blue | 1400 |
| Constant | 0900 |
| Ebony | 0915, 1530, 1836 |
| Echinus | 0925, 1020, 1116, 1214, 1310, 1506, 1700, 1757 |
| Emerald Spring | 1800 |
| Ledge | 0850 |
| Pinwheel | 0900 |
| Scummy Pool | 0900 |
| Steamboat | 1800 |
| Values for Old Faithful Area | 1966-07-27 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:47 |
| Civil Twilight Begin | 05:30 |
| Sunrise | 06:04 |
| Sunset | 20:54 |
| Civil Twilight End | 21:28 |
| Nautical Twilight End | 22:11 |
| Astronomical Twilight End | 23:02 |
| Moon Illumination | 75.39% |