| Geyser | 1966-08-19 |
|---|---|
| Ebony | 0813, 1156, 1615 |
| Echinus | 0825, 0930, 1034, 1139, 1240, 1343, 1446, 1550, 1655 |
| Harding | 0800 |
| Ledge | 1154 |
| Steamboat | 0800 |
| Valentine | 0800 A |
| Values for Old Faithful Area | 1966-08-19 |
|---|---|
| Astronomical Twilight Begin | 04:39 |
| Nautical Twilight Begin | 05:21 |
| Civil Twilight Begin | 05:59 |
| Sunrise | 06:30 |
| Sunset | 20:23 |
| Civil Twilight End | 20:54 |
| Nautical Twilight End | 21:32 |
| Astronomical Twilight End | 22:13 |
| Moon Illumination | 11.17% |