You want an object to “orbit” (move in a circle) around another object.
This is a common beginner question, and often comes after a bunch of messy experimenting with trig functions. The answer is much simpler:
Place the orbiting sprite in a child node of the main sprite (we’re calling it “Pivot”). Give it an offset and rotate the
extends Node2D export var rotation_speed = PI func _process(delta): $Sprite/Pivot.rotation += rotation_speed * delta
This works just as well in 3D, too:
extends Spatial export var rotation_speed = PI func _process(delta): $MeshInstance/Pivot.rotate_y(rotation_speed * delta)