longTermEquatorPole function

Vector3 longTermEquatorPole(
  1. double t
)

Pole of the mean equator of date at t as a unit vector in the J2000 mean equator and equinox frame (long-term model, as longTermEclipticPole).

Implementation

Vector3 longTermEquatorPole(double t) {
  final (x, y) = longTermEquatorPoleAngles(t);
  final w = x * x + y * y;
  return Vector3(x, y, w < 1 ? math.sqrt(1 - w) : 0);
}