Here the Inner Planets—Earth, Mars, Venus and Mercury—gather quickly and parade past us in this stunning view!  But conditions often change rapidly in the cosmos, so such a gathering may not occur again for hundreds or even thousands of years!  As our Moon orbits Earth, notice how you can easily see the relative tilts and rotations of a few planets.  But mysterious Venus hides its snails-paced rotation with its thick clouds that rotate much faster than that planet itself.  Even so, the clouds of Venus do reveal that this planet's rotation is in the opposite direction of the rotations of Earth and Mars!  As Mercury, the closest planet to the Sun, speeds past our field of view, it reveals little of its spin and tilt because it spins so slowly.

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