| Geyser | 1966-07-20 |
|---|---|
| Blue | 1930 ie |
| Cistern Spring | 1800 |
| Echinus | 0824, 0925, 1020, 1129, 1252, 1435, 1540, 1643, 1746 |
| Ledge | 2000 A |
| Steamboat | 1800 |
| Valentine | 1340 A |
| Values for Old Faithful Area | 1966-07-20 |
|---|---|
| Astronomical Twilight Begin | 03:44 |
| Nautical Twilight Begin | 04:37 |
| Civil Twilight Begin | 05:22 |
| Sunrise | 05:57 |
| Sunset | 21:01 |
| Civil Twilight End | 21:36 |
| Nautical Twilight End | 22:21 |
| Astronomical Twilight End | 23:14 |
| Moon Illumination | 6.18% |