| Geyser | 1966-09-01 |
|---|---|
| Blue | 1620 ie |
| Echinus | 0745, 0846, 0949, 1052, 1153, 1256, 1356, 1456, 1558 |
| Harding | 0800 |
| Ledge | 1700 |
| Steamboat | 0800-1430 |
| Values for Old Faithful Area | 1966-09-01 |
|---|---|
| Astronomical Twilight Begin | 05:01 |
| Nautical Twilight Begin | 05:39 |
| Civil Twilight Begin | 06:15 |
| Sunrise | 06:45 |
| Sunset | 20:00 |
| Civil Twilight End | 20:30 |
| Nautical Twilight End | 21:06 |
| Astronomical Twilight End | 21:44 |
| Moon Illumination | 98.63% |