| Geyser | 1966-08-09 |
|---|---|
| Ebony | 1014 |
| Echinus | 1018, 1120, 1224, 1432, 1536, 1638 |
| Harding | 1550 |
| Ledge | 1915 |
| Steamboat | 0800 |
| Valentine | 1550 |
| Values for Old Faithful Area | 1966-08-09 |
|---|---|
| Astronomical Twilight Begin | 04:21 |
| Nautical Twilight Begin | 05:06 |
| Civil Twilight Begin | 05:46 |
| Sunrise | 06:19 |
| Sunset | 20:38 |
| Civil Twilight End | 21:10 |
| Nautical Twilight End | 21:50 |
| Astronomical Twilight End | 22:35 |
| Moon Illumination | 52.86% |