| Geyser | 1991-05-13 |
|---|---|
| Whistle | 1991-05-12 0000-1991-05-24 0000 |
| Values for Old Faithful Area | 1991-05-13 |
|---|---|
| Astronomical Twilight Begin | 03:53 |
| Nautical Twilight Begin | 04:42 |
| Civil Twilight Begin | 05:24 |
| Sunrise | 05:58 |
| Sunset | 20:41 |
| Civil Twilight End | 21:14 |
| Nautical Twilight End | 21:56 |
| Astronomical Twilight End | 22:45 |
| Moon Illumination | 1.31% |