| Geyser | 1967-08-20 |
|---|---|
| Mud Spring | 1800 |
| Vent | 0000 A |
| Values for Old Faithful Area | 1967-08-20 |
|---|---|
| Astronomical Twilight Begin | 04:41 |
| Nautical Twilight Begin | 05:22 |
| Civil Twilight Begin | 06:00 |
| Sunrise | 06:31 |
| Sunset | 20:21 |
| Civil Twilight End | 20:52 |
| Nautical Twilight End | 21:30 |
| Astronomical Twilight End | 22:12 |
| Moon Illumination | 99.98% |