| Geyser | 1966-08-17 |
|---|---|
| Blue | 1255 ie |
| Cistern Spring | 0945 |
| Dark Cavern | 1600 |
| Echinus | 0850, 0945, 1041, 1137, 1234, 1330, 1424, 1520, 1616, 1711 |
| Harding | 0810 |
| Ledge | 1547 |
| Steamboat | 0815-1730 |
| Valentine | 1810 |
| Values for Old Faithful Area | 1966-08-17 |
|---|---|
| Astronomical Twilight Begin | 04:36 |
| Nautical Twilight Begin | 05:18 |
| Civil Twilight Begin | 05:57 |
| Sunrise | 06:28 |
| Sunset | 20:26 |
| Civil Twilight End | 20:57 |
| Nautical Twilight End | 21:36 |
| Astronomical Twilight End | 22:18 |
| Moon Illumination | 0.88% |