The Cesium API describes how the SampledPositionProperty can be used to attach derivatives like velocities to an entity.
There is also a function called "getValue" for that property. However, in the API there is no function that describes how to get the derivative at a specific time. Does Cesium even interpolate values for the derivatives?
Is there any other functionality that provides this?
I wish you a good start in the new year and keep on doing your great work!