/** This draws the current view of Jupiter and its moons using the routines in planets.frink. */ use planets.frink a = new Animation[1/30 s] for d = now[] to now[] + 1 month step 20 minutes { println[d] g = Planet.drawJupiterMoonsUnrotated[d, 0, 0, 1] g.color[0,0,0,0] g.drawRectSides[-27,-2,27,2] a.add[g.invertGrays[]] } a.write["JupiterMoons.gif", 800, 80]