public function testToEclip()
{
// Earth -> Venus @ 2015-Nov-08 23:20:34.000 UT
$dt = AstroDate::jd(2457335.47261574);
$x = Distance::au(-0.7956853147170494);
$y = Distance::au(-0.00807301690301796);
$z = Distance::au(0.01392567642390632);
$c = new Cartesian(Frame::ICRF(), $dt->toEpoch(), $x, $y, $z);
$equat = $c->toEquat();
$eclip = $equat->toEclip();
$prec = Angle::arcmin(13)->deg;
$this->assertEquals(180.3510658, $eclip->lon->deg, 'λ', $prec);
$this->assertEquals(1.1487465, $eclip->lat->deg, 'β', $prec);
}
