src/Marando/AstroDate/AstroDate.php
public static function equinoxAutumn($year)
    {
        $jd = static::equinoxSeptember((int)$year, false);

        return AstroDate::jd($jd, TimeScale::TT());
    }
public static function equinoxAutumn($year)
    {
        $jd = static::equinoxSeptember((int)$year, false);

        return AstroDate::jd($jd, TimeScale::TT());
    }
Creates a new AstroDate instance representing the Autumn Equinox of the
provided year

@param  int $year

@return static