| Geyser | 1991-11-09 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-09 |
|---|---|
| Astronomical Twilight Begin | 05:31 |
| Nautical Twilight Begin | 06:05 |
| Civil Twilight Begin | 06:40 |
| Sunrise | 07:11 |
| Sunset | 17:03 |
| Civil Twilight End | 17:33 |
| Nautical Twilight End | 18:08 |
| Astronomical Twilight End | 18:42 |
| Moon Illumination | 7.81% |