| Geyser | 1991-11-19 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-19 |
|---|---|
| Astronomical Twilight Begin | 05:42 |
| Nautical Twilight Begin | 06:17 |
| Civil Twilight Begin | 06:52 |
| Sunrise | 07:24 |
| Sunset | 16:52 |
| Civil Twilight End | 17:24 |
| Nautical Twilight End | 17:59 |
| Astronomical Twilight End | 18:34 |
| Moon Illumination | 90.92% |