| Geyser | 1966-07-21 |
|---|---|
| Blue | 2000 |
| Cistern Spring | 1800 |
| Echinus | 0812, 0921, 1030, 1140, 1248, 1358, 1504, 1611, 1719 |
| Ledge | 2000 |
| Steamboat | 1800 |
| Valentine | 1200 A |
| Values for Old Faithful Area | 1966-07-21 |
|---|---|
| Astronomical Twilight Begin | 03:46 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:23 |
| Sunrise | 05:58 |
| Sunset | 21:00 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:20 |
| Astronomical Twilight End | 23:13 |
| Moon Illumination | 13.25% |