| Geyser | 1991-11-16 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-16 |
|---|---|
| Astronomical Twilight Begin | 05:39 |
| Nautical Twilight Begin | 06:13 |
| Civil Twilight Begin | 06:49 |
| Sunrise | 07:20 |
| Sunset | 16:55 |
| Civil Twilight End | 17:26 |
| Nautical Twilight End | 18:02 |
| Astronomical Twilight End | 18:36 |
| Moon Illumination | 66.44% |