MoonEarthSun_Turtle.py

# Moon, Earth, Sun orbital simulation
# using Turtle graphics
# Juhani Kaukoranta 8th June 2018

from turtle import Turtle
import math

# Moon, Sun, Earth initiation

Moon = Turtle()
Moon.hideturtle()
Earth = Turtle()
Earth.hideturtle()
Sun = Turtle()
Sun.color("yellow")
Sun.begin_fill()
Sun.hideturtle()
Sun.circle(10)
Sun.end_fill()
Moon.color("blue")
Moon.pensize(2)
Earth.color("green")
Earth.pensize(6)
Moon.up()
Moon.setposition(230,0)
Moon.down()
Earth.up()
Earth.setposition(200,0)
Earth.down()

# Earth, Sun orbit calculations

for i in range (0,360):
    xM = 200*math.cos(i*math.pi/180.0)+30*math.cos(13.4*i*math.pi/180.0)
    yM = 200*math.sin(i*math.pi/180.0)+30*math.sin(13.4*i*math.pi/180.0)
    Moon.setposition(xM,yM)
    xE = 200*math.cos(i*math.pi/180.0)
    yE = 200*math.sin(i*math.pi/180.0)
    Earth.setposition(xE,yE)