astronomy/source/kotlin/doc/rotation-eqj-ect.md

//astronomy/io.github.cosinekitty.astronomy/rotationEqjEct

rotationEqjEct

fun rotationEqjEct(time: Time): RotationMatrix

Calculates a rotation matrix from J2000 mean equator (EQJ) to true ecliptic of date (ECT).

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: ECT = ecliptic system, using true equinox of the specified date/time.

Parameters

time	The date and time at which the Earth's equator defines the target orientation.