| Geyser | 1991-11-17 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-17 |
|---|---|
| Astronomical Twilight Begin | 05:40 |
| Nautical Twilight Begin | 06:15 |
| Civil Twilight Begin | 06:50 |
| Sunrise | 07:21 |
| Sunset | 16:54 |
| Civil Twilight End | 17:26 |
| Nautical Twilight End | 18:01 |
| Astronomical Twilight End | 18:35 |
| Moon Illumination | 75.54% |