Type Alias CalcFrame

CalcFrame:
    | "ecliptic-true-of-date"
    | "ecliptic-mean-of-date"
    | "ecliptic-j2000"
    | "ecliptic-icrs"
    | "equatorial-true-of-date"
    | "equatorial-mean-of-date"
    | "equatorial-j2000"
    | "equatorial-icrs"

A reference plane (the ecliptic or the equator) and the equinox its longitudes count from: the true or the mean equinox of date, the mean equinox of J2000.0, or the ICRS axes.