| Geyser | 1931-06-25 |
|---|---|
| Dark Cavern | 1425 min, 1530 min, 1605 min |
| Ledge | 0930 min |
| Values for Old Faithful Area | 1931-06-25 |
|---|---|
| Astronomical Twilight Begin | 02:10 |
| Nautical Twilight Begin | 03:13 |
| Civil Twilight Begin | 04:02 |
| Sunrise | 04:39 |
| Sunset | 20:11 |
| Civil Twilight End | 20:48 |
| Nautical Twilight End | 21:37 |
| Astronomical Twilight End | 22:40 |
| Moon Illumination | 74.85% |