Orbit.cs

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

public class Orbit : MonoBehaviour {

	public float xSpread;
	public float zSpread;
	public float yOffset;
	public Transform centerPoint;

	public float rotSpeed;
	public bool rotateClockwise;

	float timer = 0;
	
	// Update is called once per frame
	void Update () {
		timer += Time.deltaTime * rotSpeed;
		Rotate();		
	}

	void Rotate() {
		if(rotateClockwise) {
			float x = -Mathf.Cos(timer) * xSpread;
			float z = Mathf.Sin(timer) * zSpread;
			Vector3 pos = new Vector3(x, yOffset, z);
			transform.position = pos + centerPoint.position;
		} else {
			float x = Mathf.Cos(timer) * xSpread;
			float z = Mathf.Sin(timer) * zSpread;
			Vector3 pos = new Vector3(x, yOffset, z);
			transform.position = pos + centerPoint.position;
		}
	}
}