Returns apparent geocentric true ecliptic coordinates of date for the Sun.
This function is used for calculating the times of equinoxes and solstices.
Geocentric means coordinates as the Sun would appear to a hypothetical observer
at the center of the Earth.
Ecliptic coordinates of date are measured along the plane of the Earth's mean
orbit around the Sun, using the
equinox
of the Earth as adjusted for precession and nutation of the Earth's
axis of rotation on the given date.
Returns apparent geocentric true ecliptic coordinates of date for the Sun.
This function is used for calculating the times of equinoxes and solstices.
Geocentric means coordinates as the Sun would appear to a hypothetical observer at the center of the Earth. Ecliptic coordinates of date are measured along the plane of the Earth's mean orbit around the Sun, using the equinox of the Earth as adjusted for precession and nutation of the Earth's axis of rotation on the given date.