| Geyser | 1991-11-27 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-27 |
|---|---|
| Astronomical Twilight Begin | 05:51 |
| Nautical Twilight Begin | 06:26 |
| Civil Twilight Begin | 07:02 |
| Sunrise | 07:34 |
| Sunset | 16:47 |
| Civil Twilight End | 17:19 |
| Nautical Twilight End | 17:55 |
| Astronomical Twilight End | 18:30 |
| Moon Illumination | 65.11% |