| Geyser | 1991-10-28 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-10-28 |
|---|---|
| Astronomical Twilight Begin | 05:17 |
| Nautical Twilight Begin | 05:51 |
| Civil Twilight Begin | 06:25 |
| Sunrise | 06:55 |
| Sunset | 17:19 |
| Civil Twilight End | 17:49 |
| Nautical Twilight End | 18:23 |
| Astronomical Twilight End | 18:56 |
| Moon Illumination | 72.31% |