public static function Falp03($t) {
    $a;

    /* Mean anomaly of the Sun (IERS Conventions 2003). */
    $a = fmod(1287104.793048 +
                    $t * ( 129596581.0481 +
                    $t * ( - 0.5532 +
                    $t * ( 0.000136 +
                    $t * ( - 0.00001149 ) ) ) ), TURNAS) * DAS2R;

    return $a;
  }