lmst method
Calculate Local Mean Sidereal Time for this Julian date at the given longitude.
longitude
The longitude, in radians, measured west from Greenwich.
The angle, in radians, measuring eastward from the Vernal Equinox to the given longitude.
Implementation
Angle lmst(Angle longitude) {
final rad = (gmst.radians + longitude.radians) % _twopi;
return Angle.radian(rad);
}