//[astronomy](../../index.md)/[io.github.cosinekitty.astronomy](index.md)/[rotationEqjEcl](rotation-eqj-ecl.md)

# rotationEqjEcl

fun [rotationEqjEcl](rotation-eqj-ecl.md)(): [RotationMatrix](-rotation-matrix/index.md)

Calculates a rotation matrix from J2000 mean equator (EQJ) 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: EQJ = equatorial system, using equator at J2000 epoch. Target: ECL = ecliptic system, using equator at J2000 epoch.