| Geyser | 1991-10-12 |
|---|---|
| Abyss Pool | 0930 |
| Values for Old Faithful Area | 1991-10-12 |
|---|---|
| Astronomical Twilight Begin | 05:57 |
| Nautical Twilight Begin | 06:31 |
| Civil Twilight Begin | 07:05 |
| Sunrise | 07:34 |
| Sunset | 18:45 |
| Civil Twilight End | 19:14 |
| Nautical Twilight End | 19:48 |
| Astronomical Twilight End | 20:21 |
| Moon Illumination | 19.16% |