| Geyser | 1966-08-21 |
|---|---|
| Blue | 1443 |
| Ebony | 1058 |
| Echinus | 0902, 1010, 1120, 1229, 1340, 1448 |
| Harding | 0830 |
| Ledge | 1635 |
| Steamboat | 0800 |
| Values for Old Faithful Area | 1966-08-21 |
|---|---|
| Astronomical Twilight Begin | 04:43 |
| Nautical Twilight Begin | 05:24 |
| Civil Twilight Begin | 06:02 |
| Sunrise | 06:32 |
| Sunset | 20:19 |
| Civil Twilight End | 20:50 |
| Nautical Twilight End | 21:28 |
| Astronomical Twilight End | 22:09 |
| Moon Illumination | 29.75% |