#[\AllowDynamicProperties]

class planet {

    function __construct($id, $a, $m, $i, $e, $π) {

        $this->a = $a;

        $this->e = $e;

        $this->i = $i;

        $this->id = $id;

        $this->m = $m;

        $this->n = .9856076686 / ($a * sqrt($a));

        $this->π = $π;

    }

}