| Geyser | 1991-10-24 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-10-24 |
|---|---|
| Astronomical Twilight Begin | 06:12 |
| Nautical Twilight Begin | 06:46 |
| Civil Twilight Begin | 07:20 |
| Sunrise | 07:49 |
| Sunset | 18:25 |
| Civil Twilight End | 18:54 |
| Nautical Twilight End | 19:28 |
| Astronomical Twilight End | 20:02 |
| Moon Illumination | 99.25% |