I am trying to calculate the orbit parameters for a cubesat (Duration, eclipse time and sun time) can someone help please
The easiest way to get this information is to use a tool such as the Satellite Tool Kit (STK). Essentially, this information varies over time, especially for high inclination orbits. A good orbital simulator will allow you to enter mean altitude, inclination, and eccentricity (Or alternatively apogee/ perigee/inclination)
If you already have the satellite in orbit, then you can import the satellite into STK, by looking up the satellite from their orbit. The eclipse times are an available report.