//[astronomy](../../index.md)/[io.github.cosinekitty.astronomy](index.md)/[rotationEctEqd](rotation-ect-eqd.md)

# rotationEctEqd

fun [rotationEctEqd](rotation-ect-eqd.md)(time: [Time](-time/index.md)): [RotationMatrix](-rotation-matrix/index.md)

Calculates a rotation matrix from true ecliptic of date (ECT) to equator of date (EQD).

This is one of the family of functions that returns a rotation matrix for converting from one orientation to another. Source: ECT = true ecliptic of date Target: EQD = equator of date

#### Return

A rotation matrix that converts ECT to EQD.

## Parameters

| | |
|---|---|
| time | The date and time of the ecliptic/equator conversion. |