What is the unit used for the 'semiAxis' values of an ellipse?

Hello,

I am working on a project where part of the project is the display of satellite swaths.
A satellite is a Cesium entity, and I am displaying the range of a satellite via the Ellipse property.
The diameter of this ellipse is described by the SemiMajorAxis and SemiMinorAxis properties. In the documentation, these values are measured in metres.

However, I find that the representations I get are inconsistent.

For example, if I set these two properties to 400,000 metres, i.e. above the radius of the earth, the ellipse displayed is very small.

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const viewer = new Cesium.Viewer("cesiumContainer");
const dataSourcePromise = Cesium.CzmlDataSource.load(czml);
viewer.dataSources.add(dataSourcePromise);
viewer.zoomTo(dataSourcePromise);

Do you have an explanation?

The unit is ‘meters’.

The radius of the small circle in the screenshot is 400000 meters, which is 400 Kilometers.

The radius of the earth is 6371000 meters (6371 Kilometers).