Circle Orbital Simulation (Without Classes)

import simplegui
import math

Width = 500
Height = 500

player_sprite = simplegui.load_image("https://i.imglnx.com/fhN53R.png")
sun_sprite_image = simplegui.load_image("https://i.imglnx.com/Vsd87P.png")

circle1_center = [50, 450]
circle1_radius = 17
velocity_circle1 = [0,0]
acceleration1 = 2
bounce_distance1 = 10

sun_hitbox_center = [Width/2,Height/2]
sun_hitbox_radius = 40

def keydown1(key):
    global velocity_circle1, acceleration1
    if key == simplegui.KEY_MAP["left"]:
        velocity_circle1[0] -= acceleration1
    elif key == simplegui.KEY_MAP["up"]:
        velocity_circle1[1] -= acceleration1
    elif key == simplegui.KEY_MAP["right"]:
        velocity_circle1[0] += acceleration1
    elif key == simplegui.KEY_MAP["down"]:
        velocity_circle1[1] += acceleration1

def keyup1(key):
    global velocity_circle1
    if key == simplegui.KEY_MAP["left"]:
        velocity_circle1[0] = 0
    elif key == simplegui.KEY_MAP["up"]:
        velocity_circle1[1] = 0
    elif key == simplegui.KEY_MAP["right"]:
        velocity_circle1[0] = 0
    elif key == simplegui.KEY_MAP["down"]:
        velocity_circle1[1] = 0

def draw_sprites(canvas):
    global Width, Height, circle1_center, velocity_circle1, sun_hitbox_center, circle1_radius, sun_hitbox_radius, bounce_distance1
    canvas.draw_image(player_sprite, [1060/2, 1060/2], [1060, 1060], circle1_center, [40, 40])
    canvas.draw_image(sun_sprite_image, [3002/2, 3005/2], [3002, 3005], sun_hitbox_center, [70, 70])

    circle1_center[0] = circle1_center[0] + velocity_circle1[0]
    circle1_center[1] = circle1_center[1] + velocity_circle1[1]

    x = math.pow((sun_hitbox_center[0]-circle1_center[0]), 2)
    y = math.pow((sun_hitbox_center[1]-circle1_center[1]), 2)
    distance = math.sqrt(x + y)

    if circle1_radius+sun_hitbox_radius >= distance:
        if circle1_center[0] > sun_hitbox_center[0]:
            circle1_center[0] += bounce_distance1
        elif circle1_center[1] > sun_hitbox_center[1]:
            circle1_center[1] += bounce_distance1
        elif circle1_center[0] < sun_hitbox_center[0]:
            circle1_center[0] -= bounce_distance1
        elif circle1_center[1] < sun_hitbox_center[1]:
            circle1_center[1] -= bounce_distance1

    #Circle-border collision
    if circle1_center[0] <= circle1_radius:
        circle1_center[0] += bounce_distance1
    elif circle1_center[0] >= Width-circle1_radius:
        circle1_center[0] -= bounce_distance1
    elif circle1_center[1] <= circle1_radius:
        circle1_center[1] += bounce_distance1
    elif circle1_center[1] >= Height-circle1_radius:
        circle1_center[1] -= bounce_distance1

frame = simplegui.create_frame("Circle Orbital Simulation", Width, Height)

frame.set_draw_handler(draw_sprites)

frame.set_keydown_handler(keydown1)
frame.set_keyup_handler(keyup1)

frame.start()