how change position of ellipse?

I want to draw ellipse using code below:

var blueEllipse = viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(-95.0, 40.0, 100000.0),
    name : 'Blue translucent, rotated, and extruded ellipse with outline',
    ellipse : {
        semiMinorAxis : 150000.0,
        semiMajorAxis : 300000.0,
        material : Cesium.Color.BLUE.withAlpha(0.5),
        outline : true

but position of ellipse is his center, how can i change it? i need to make left end of ellipse be in this coordinates of position, not his center((


Cesium can only draw the ellipse centered around the position, so you will have to compute the center position from the data you have.