| Geyser | 1991-12-28 |
|---|---|
| Fantail | 1991-10-20 0000-1992-05-01 2359 |
| Values for Old Faithful Area | 1991-12-28 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:58 |
| Sunset | 16:50 |
| Civil Twilight End | 17:23 |
| Nautical Twilight End | 18:00 |
| Astronomical Twilight End | 18:36 |
| Moon Illumination | 47.86% |