//astronomy/io.github.cosinekitty.astronomy/equatorialToEcliptic
fun equatorialToEcliptic(eqj: Vector): Ecliptic
Converts a J2000 mean equator (EQJ) vector to a true ecliptic of date (ETC) vector and angles.
Given coordinates relative to the Earth's equator at J2000 (the instant of noon UTC on 1 January 2000), this function converts those coordinates to true ecliptic coordinates of date, which are relative to the plane of the Earth's orbit around the Sun.
Spherical and vector coordinates expressed in true ecliptic coordinates of date (ECT)..
| eqj | Equatorial coordinates in the J2000 frame of reference. You can call geoVector to obtain suitable equatorial coordinates. |