<?php 

public function calculateEccentricAnomaly($averageAnomaly, $eccentricity, $decimale = 7) {

        $previous = 0;

        $ea       = $averageAnomaly;

        while ($ea != $previous) {

            $previous = $ea;

            $ea       = self::roundness($averageAnomaly + $eccentricity * sin($ea), $decimale);

        }

        return $ea;

    }



    public function roundness($x, $n) {

        $mult = pow(10, $n);

        $x    = round($x * $mult) / $mult;

        return $x;

    }