| Geyser | 1967-08-19 |
|---|---|
| Mud Spring | 0500 A, 0815, 1200, 1201 |
| Values for Old Faithful Area | 1967-08-19 |
|---|---|
| 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 | 22:14 |
| Moon Illumination | 99.23% |