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); }