text: /*global defineSuite*/
  defineSuite([
          'Core/Simon1994PlanetaryPositions',
          'Core/defined',
          'Core/JulianDate',
          'Core/Math',
          'Core/Matrix3',
          'Core/TimeStandard',
          'Core/Transforms'
      ], function(
          PlanetaryPositions,
          defined,
          JulianDate,
          CesiumMath,
          Matrix3,
          TimeStandard,
          Transforms) {
      "use strict";
  
      // Values for the X Y and Z were found using the STK Components GeometryTransformer on the position of the
      // sun center of mass point and the earth J2000 reference frame.
      it('computes correct sun position', function() {
          var date = new JulianDate(2451545, 0, TimeStandard.TAI);
          var sun = PlanetaryPositions.computeSunPositionInEarthInertialFrame(date);
          var X = 26500268539.790234;
          var Y = -132756447253.27325;
          var Z = -57556483362.533806;
          expect(X).toEqualEpsilon(sun.x, CesiumMath.EPSILON2);
          expect(Y).toEqualEpsilon(sun.y, CesiumMath.EPSILON2);
          expect(Z).toEqualEpsilon(sun.z, CesiumMath.EPSILON2);
  
          date = new JulianDate(2456401.5, 0, TimeStandard.TAI);
          sun = PlanetaryPositions.computeSunPositionInEarthInertialFrame(date);
          X = 131512388940.33589;
          Y = 66661342667.949928;
          Z = 28897975607.905258;
          expect(X).toEqualEpsilon(sun.x, CesiumMath.EPSILON3);
          expect(Y).toEqualEpsilon(sun.y, CesiumMath.EPSILON3);
          expect(Z).toEqualEpsilon(sun.z, CesiumMath.EPSILON3);
  
          date = new JulianDate(2455998.591667, 0, TimeStandard.TAI);
          sun = PlanetaryPositions.computeSunPositionInEarthInertialFrame(date);
          X = 147109989956.19534;
          Y = -19599996881.217579;
          Z = -8497578102.7696457;
          expect(X).toEqualEpsilon(sun.x, CesiumMath.EPSILON3);
          expect(Y).toEqualEpsilon(sun.y, CesiumMath.EPSILON3);
          expect(Z).toEqualEpsilon(sun.z, CesiumMath.EPSILON3);
      });
  
      // Values for X Y and Z were found using the STK Components GeometryTransformer on the Simon 1994 moon point and the earth
      // J2000 reference frame.
      it('computes correct moon position', function() {
          var date = new JulianDate(2451545.0, 0, TimeStandard.TAI);
          var moon = PlanetaryPositions.computeMoonPositionInEarthInertialFrame(date);
          var X = -291632410.61232185;
          var Y = -266522146.36821631;
          var Z = -75994518.081043154;
          expect(X).toEqualEpsilon(moon.x, CesiumMath.EPSILON4);
          expect(Y).toEqualEpsilon(moon.y, CesiumMath.EPSILON4);
          expect(Z).toEqualEpsilon(moon.z, CesiumMath.EPSILON4);
  
          date = new JulianDate(2456401.5, 0, TimeStandard.TAI);
          moon = PlanetaryPositions.computeMoonPositionInEarthInertialFrame(date);
          X = -223792974.4736526;
          Y = 315772435.34490639;
          Z = 97913011.236112773;
          expect(X).toEqualEpsilon(moon.x, CesiumMath.EPSILON4);
          expect(Y).toEqualEpsilon(moon.y, CesiumMath.EPSILON4);
          expect(Z).toEqualEpsilon(moon.z, CesiumMath.EPSILON4);
  
          date = new JulianDate(2455998.591667, 0, TimeStandard.TAI);
          moon = PlanetaryPositions.computeMoonPositionInEarthInertialFrame(date);
          X = -268426117.00202647;
          Y = -220468861.73998192;
          Z = -110670164.58446842;
          expect(X).toEqualEpsilon(moon.x, CesiumMath.EPSILON4);
          expect(Y).toEqualEpsilon(moon.y, CesiumMath.EPSILON4);
          expect(Z).toEqualEpsilon(moon.z, CesiumMath.EPSILON4);
      });
  
      it('has the sun rising in the east and setting in the west', function() {
          //Julian dates for 24 hours, starting from July 6th 2011 @ 01:00 UTC
          var transformMatrix = new Matrix3();
          var timesOfDay = [];
          for ( var i = 1; i < 25; i++) {
              var date = new Date('July 6, 2011');
              date.setUTCHours(i, 0, 0, 0);
              timesOfDay.push(JulianDate.fromDate(date));
          }
          var angles = [];
          for (i = 0; i < 24; i++) {
              transformMatrix = Transforms.computeIcrfToFixedMatrix(timesOfDay[i], transformMatrix);
              if (!defined(transformMatrix)) {
                  transformMatrix = Transforms.computeTemeToPseudoFixedMatrix(timesOfDay[i], transformMatrix);
              }
              var position = PlanetaryPositions.computeSunPositionInEarthInertialFrame(timesOfDay[i]);
              Matrix3.multiplyByVector(transformMatrix, position, position);
              angles.push(CesiumMath.convertLongitudeRange(Math.atan2(position.y, position.x)));
          }
          //Expect a clockwise motion.
          for (i = 1; i < 24; i++) {
              expect(angles[i]).toBeLessThan(angles[i - 1]);
          }
      });
  
      it('works without a time', function() {
          PlanetaryPositions.computeSunPositionInEarthInertialFrame(undefined);
      });
  
  });
  