//astronomy/io.github.cosinekitty.astronomy/rotationHorEcl
fun rotationHorEcl(time: Time, observer: Observer): RotationMatrix
Calculates a rotation matrix from horizontal (HOR) to J2000 mean ecliptic (ECL).
This is one of the family of functions that returns a rotation matrix for converting from one orientation to another. Source: HOR = horizontal system. Target: ECL = ecliptic system, using equator at J2000 epoch.
A rotation matrix that converts HOR to ECL.
| time | The date and time of the horizontal observation. |
| observer | The location of the horizontal observer. |