| Geyser | 1981-09-18 |
|---|---|
| Echinus | 1256 |
| Vixen | 1520 |
| Values for Old Faithful Area | 1981-09-18 |
|---|---|
| Astronomical Twilight Begin | 05:27 |
| Nautical Twilight Begin | 06:02 |
| Civil Twilight Begin | 06:36 |
| Sunrise | 07:06 |
| Sunset | 19:28 |
| Civil Twilight End | 19:57 |
| Nautical Twilight End | 20:32 |
| Astronomical Twilight End | 21:07 |
| Moon Illumination | 78.22% |