| Geyser | 1966-08-12 |
|---|---|
| Blue | 1000 ie |
| Cistern Spring | 0900-1525 |
| Echinus | 0746, 0856, 1005, 1114, 1224, 1332, 1441, 1552, 1701 |
| Harding | 0950 |
| Ledge | 0530 A |
| Steamboat | 0800 |
| Valentine | 1000 |
| Values for Old Faithful Area | 1966-08-12 |
|---|---|
| Astronomical Twilight Begin | 04:27 |
| Nautical Twilight Begin | 05:11 |
| Civil Twilight Begin | 05:50 |
| Sunrise | 06:22 |
| Sunset | 20:34 |
| Civil Twilight End | 21:05 |
| Nautical Twilight End | 21:45 |
| Astronomical Twilight End | 22:29 |
| Moon Illumination | 23.1% |