| Geyser | 1967-08-28 |
|---|---|
| Mud Spring | 1200 |
| Values for Old Faithful Area | 1967-08-28 |
|---|---|
| Astronomical Twilight Begin | 04:54 |
| Nautical Twilight Begin | 05:33 |
| Civil Twilight Begin | 06:10 |
| Sunrise | 06:40 |
| Sunset | 20:08 |
| Civil Twilight End | 20:38 |
| Nautical Twilight End | 21:15 |
| Astronomical Twilight End | 21:54 |
| Moon Illumination | 49.74% |