Unity realizes rotation and Revolution

Create two sphere, Then create a script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class zhuan : MonoBehaviour
{
    
    /// <summary>
    ///  This is the object of the sub object revolution 
    /// </summary>
    public Transform m_sphere;
    /// <summary>
    ///  Sub object for rotation 
    /// </summary>
    public Transform m_sphereA;

    // Start is called before the first frame update
    void Start()
    {
    
        
    }

    // Update is called once per frame
    void Update()
    {
    
        // rotation 
        m_sphereA.Rotate(Vector3.up, Space.Self);
        // revolution 
        m_sphereA.RotateAround(m_sphere.position, m_sphere.up, Time.deltaTime * 50);// This is used to control the speed of rotation 
    }
}

After creating the script, create an empty object , Drag code in , Then drag the two objects just created for rotation into

Then run it