How to create a simple satellite trajectory

I use the. Net version of czml-writer.
I can run this, but I don’t know how to create a simple satellite trajectory.
Can we get its trajectory by some formula instead of listing it?

You must supply a list of positions when using CZML. Several options are available, outside of Cesium, to generate the data like Satellite-js.

Do you know the use and advantages of czml writer?

The orbits of satellites can be determined using Keplerian elements. The orbits of the current satellites can be found on the Celestrak website in TLE format. As a result, you can take the orbits of any satellites.

Do you mean something like this?