title: How to Make Turtles Move Together?
body: <p>Here is my code (Python beginner, please bear any of the unprofessional code), and basically what I want is to let the two turtles move on the same circle together (as you may guess, my task is about simulating a spaceship chasing the ISS).  In my code, first turtle will move around the circle, then the second turtle:</p>
  
  <pre><code>from turtle import *
  rocket=Turtle()
  ISS=Turtle()
  counter=1
  title("ISS")
  screensize(750,750)
  ISS.hideturtle()
  rocket.hideturtle()
  ISS.penup()
  ISS.left(90)
  ISS.fd(250)
  ISS.left(90)
  ISS.showturtle()
  ISS.pendown()
  rocket.penup()
  rocket.fd(250)
  rocket.left(90)
  rocket.showturtle()
  rocket.pendown()
  while counter==1:
      ISS.speed(1)
      rocket.speed(2)
      ISS.circle(250)
      rocket.circle(250)
  </code></pre>
  
  <p>My teacher has told me that "threading" will work for this, but I don't quite understand that. It would be much appreciated if someone can help me out with this ;)</p>