> The title comes from Galileo.
> His astronomical observations led him to advocate that the Sun was the centre of the solar system and the Earth orbited around it.
> However the Church authorities, refusing to look through his new fangled telescope, clung to the doctrine that the Earth was the unmoving centre of the universe.
> Galileo was forced to recant his published scientific opinions after being threatened with torture by the Inquisition.
> Despite this he was later reported to have said about the Earth “Eppur si muove” (And yet it moves).

> Galileo was the first to observe the moons of Jupiter, three of which are part of an “orbital resonance”.
> Io makes four orbits and Europa two orbits for every one orbit by Ganymede.
> This is illustrated in the figure of bars 5-8 and 21-24 though the demands of choreography require the central pair, representing Io, to defy reality and turn the opposite way from the others.
> The reel could be taken to represent the wiggles in Saturn's rings caused by small “shepherd” moons;
> the casting and hands across as the gravitational sling shot manoeuvres used to get observational space craft to the outer planets;
> and the final circle as the actually rotating and not fixed galactic background.
> Or invent your own symbolism!