MoonEarthSun.py

# Moon orbits Earth, Earth orbits Sun
# Juhani Kaukoranta 7.6.2018
import matplotlib.pyplot as plt
from math import pi
import numpy as np

u = np.arange(0,2*pi,0.01)
# Moon orbit
xM = 8*np.cos(u) + np.cos(13.4*u)
yM = 8*np.sin(u) + np.sin(13.4*u)
plt.plot(xM,yM, label = "Moon")

# Earth orbit Sun
xE = 8*np.cos(u)
yE = 8*np.sin(u)
plt.plot(xE,yE, label = "Earth")
# Sun plot
plt.plot(0,0,'yo')

plt.title('Moon orbit Earth, Earth orbit Sun')
plt.legend()
plt.show()