Caption
:
An
animation
illustrating the 1:2:4
Laplace resonance
of the
orbits
of
Jupiter's
Galilean moons
Io
,
Europa
, and
Ganymede
. The
orbits
are being viewed from the
NCP
side of the
celestial sphere
, and so
orbit
eastward
(i.e.,
counterclockwise
).