a, d: adjust the moon's angular speed left/right arrow: adjust the planet's angular speed up/down arrow: adjust the radius of the planet's orbit Enjoy the view! :-)
My second experiment with pen, trying to figure out how to render objects and animation. It is 100% pen. The stars fade up and down periodically. The moon goes up in front of the planet, and goes down behind the planet (as long as its angular speed is positive; when it turns negative, it goes the other way around). Music: Galt MacDermot (from the 1979 Hair soundtrack)
