| Geyser | 1966-08-08 |
|---|---|
| Blue | 1030 |
| Cistern Spring | 1800 |
| Ebony | 1553 |
| Echinus | 0831, 0927, 1023, 1119, 1217, 1313, 1411, 1509, 1608, 1706 |
| Emerald Spring | 1800 |
| Steamboat | 0915 |
| Valentine | 1154 |
| Values for Old Faithful Area | 1966-08-08 |
|---|---|
| Astronomical Twilight Begin | 04:20 |
| Nautical Twilight Begin | 05:05 |
| Civil Twilight Begin | 05:45 |
| Sunrise | 06:17 |
| Sunset | 20:39 |
| Civil Twilight End | 21:12 |
| Nautical Twilight End | 21:52 |
| Astronomical Twilight End | 22:37 |
| Moon Illumination | 62.56% |