| Geyser | 1991-05-24 |
|---|---|
| Whistle | 1991-05-12 0000-0000 |
| Values for Old Faithful Area | 1991-05-24 |
|---|---|
| Astronomical Twilight Begin | 03:33 |
| Nautical Twilight Begin | 04:27 |
| Civil Twilight Begin | 05:12 |
| Sunrise | 05:47 |
| Sunset | 20:53 |
| Civil Twilight End | 21:27 |
| Nautical Twilight End | 22:12 |
| Astronomical Twilight End | 23:06 |
| Moon Illumination | 83.32% |