| Geyser | 1931-08-02 |
|---|---|
| Dark Cavern | 0955 |
| Values for Old Faithful Area | 1931-08-02 |
|---|---|
| Astronomical Twilight Begin | 03:07 |
| Nautical Twilight Begin | 03:55 |
| Civil Twilight Begin | 04:37 |
| Sunrise | 05:10 |
| Sunset | 19:48 |
| Civil Twilight End | 20:21 |
| Nautical Twilight End | 21:03 |
| Astronomical Twilight End | 21:51 |
| Moon Illumination | 87.15% |