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Assets/Scripts/Demo/MoveCircle.cs

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+using UnityEngine;
+
+public class MoveCircle : MonoBehaviour
+{
+    [SerializeField] float radius = 1f;
+    [SerializeField] float angularSpeed = 1f;
+    float angle = 0;
+    Vector3 center;
+
+    void Awake()
+    {
+        center = transform.position;
+    }
+
+    void Update()
+    {
+        angle += Time.deltaTime * angularSpeed;
+        Vector3 dir = Quaternion.AngleAxis(angle, Vector3.forward) * Vector3.up;
+        transform.position = center + dir * radius;
+    }
+}