| Geyser | 1991-10-26 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-10-26 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:22 |
| Sunrise | 07:52 |
| Sunset | 18:22 |
| Civil Twilight End | 18:51 |
| Nautical Twilight End | 19:25 |
| Astronomical Twilight End | 19:59 |
| Moon Illumination | 90.29% |