| Geyser | 1991-11-10 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-10 |
|---|---|
| Astronomical Twilight Begin | 05:32 |
| Nautical Twilight Begin | 06:06 |
| Civil Twilight Begin | 06:41 |
| Sunrise | 07:12 |
| Sunset | 17:01 |
| Civil Twilight End | 17:32 |
| Nautical Twilight End | 18:07 |
| Astronomical Twilight End | 18:41 |
| Moon Illumination | 13.76% |