| Geyser | 1966-08-23 |
|---|---|
| Blue | 1723 |
| Cistern Spring | 0840-1745 |
| Ebony | 1330 |
| Echinus | 0927, 1022, 1118, 1213, 1405, 1501, 1555, 1652, 1748 |
| Harding | 1155 |
| Ledge | 1155 |
| Steamboat | 0800 |
| Valentine | 1545 |
| Values for Old Faithful Area | 1966-08-23 |
|---|---|
| Astronomical Twilight Begin | 04:46 |
| Nautical Twilight Begin | 05:27 |
| Civil Twilight Begin | 06:04 |
| Sunrise | 06:35 |
| Sunset | 20:16 |
| Civil Twilight End | 20:47 |
| Nautical Twilight End | 21:24 |
| Astronomical Twilight End | 22:04 |
| Moon Illumination | 51.32% |