| Geyser | 1966-07-17 |
|---|---|
| Blue | 0815 |
| Dark Cavern | 0800 |
| Echinus | 0901, 1007, 1113, 1215, 1325, 1425, 1525, 1622 |
| Ledge | 1200, 1545 ie |
| Scummy Pool | 1800 |
| Steamboat | 1800 |
| Valentine | 1404 |
| Values for Old Faithful Area | 1966-07-17 |
|---|---|
| Astronomical Twilight Begin | 03:38 |
| Nautical Twilight Begin | 04:34 |
| Civil Twilight Begin | 05:19 |
| Sunrise | 05:54 |
| Sunset | 21:04 |
| Civil Twilight End | 21:39 |
| Nautical Twilight End | 22:24 |
| Astronomical Twilight End | 23:19 |
| Moon Illumination | 1.22% |