| Geyser | 1991-05-22 |
|---|---|
| Whistle | 1991-05-12 0000-1991-05-24 0000 |
| Values for Old Faithful Area | 1991-05-22 |
|---|---|
| Astronomical Twilight Begin | 03:36 |
| Nautical Twilight Begin | 04:29 |
| Civil Twilight Begin | 05:14 |
| Sunrise | 05:48 |
| Sunset | 20:51 |
| Civil Twilight End | 21:25 |
| Nautical Twilight End | 22:09 |
| Astronomical Twilight End | 23:03 |
| Moon Illumination | 65.33% |