| Geyser | 1966-07-19 |
|---|---|
| Blue | 1715 ie |
| Cistern Spring | 1800 |
| Echinus | 0825, 0926, 1025, 1122, 1221, 1418, 1517, 1615 |
| Ledge | 1942 ie |
| Scummy Pool | 1800 |
| Steamboat | 0800 |
| Valentine | 1126 |
| Values for Old Faithful Area | 1966-07-19 |
|---|---|
| Astronomical Twilight Begin | 03:42 |
| Nautical Twilight Begin | 04:36 |
| Civil Twilight Begin | 05:21 |
| Sunrise | 05:56 |
| Sunset | 21:02 |
| Civil Twilight End | 21:37 |
| Nautical Twilight End | 22:22 |
| Astronomical Twilight End | 23:16 |
| Moon Illumination | 1.67% |