| Geyser | 1991-11-22 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-11-22 |
|---|---|
| Astronomical Twilight Begin | 05:46 |
| Nautical Twilight Begin | 06:20 |
| Civil Twilight Begin | 06:56 |
| Sunrise | 07:28 |
| Sunset | 16:50 |
| Civil Twilight End | 17:22 |
| Nautical Twilight End | 17:58 |
| Astronomical Twilight End | 18:32 |
| Moon Illumination | 99.86% |