| Geyser | 1991-05-19 |
|---|---|
| Giantess | 1820 ie |
| Whistle | 1991-05-12 0000-1991-05-24 0000 |
| Values for Old Faithful Area | 1991-05-19 |
|---|---|
| Astronomical Twilight Begin | 03:42 |
| Nautical Twilight Begin | 04:33 |
| Civil Twilight Begin | 05:17 |
| Sunrise | 05:51 |
| Sunset | 20:47 |
| Civil Twilight End | 21:22 |
| Nautical Twilight End | 22:05 |
| Astronomical Twilight End | 22:57 |
| Moon Illumination | 32.69% |