| Geyser | 1968-08-21 |
|---|---|
| Ebony | 0000 A, 1500 |
| Echinus | 0714, 0751, 0807, 1055, 1210 |
| Harding | 1500 |
| Ledge | 1200 |
| Valentine | 1500, 1600 |
| Values for Old Faithful Area | 1968-08-21 |
|---|---|
| Astronomical Twilight Begin | 04:44 |
| Nautical Twilight Begin | 05:25 |
| Civil Twilight Begin | 06:02 |
| Sunrise | 06:33 |
| Sunset | 20:19 |
| Civil Twilight End | 20:49 |
| Nautical Twilight End | 21:27 |
| Astronomical Twilight End | 22:08 |
| Moon Illumination | 8.06% |