Retrograde Rotation - The westward rotation of a solar system body
Richness - A measure of the number of galaxies in a cluster. The more galaxies there are, the greater the richness ...
RETROGRADE ROTATION
Retrograde rotation means rotating in the opposite direction.
[edit] Retrograde rotation
Main article: Retrograde motion#Retrograde rotation ...
Venus has a retrograde rotation which means it rotates on its axis in the opposite direction from the Earth's rotation. This causes the Sun to rise in the west and move eastward across the sky.
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How unique is the retrograde rotation of Venus?
When will the next alignment of the planets be?
Can an alignment of the planets affect the Earth?
the stellar halo is very large, sparse, and does not rotate (or has perhaps even a slight retrograde rotation), with no apparent substructure ...
explained in, or at least not at odds with, a theory of galactic evolution, include: * the stellar disk is quite thin, dense, and rotates * the stellar halo is very large, sparse, and does not rotate (or has perhaps even a slight retrograde rotation), ...
8a"recall our earlier discussion of Venus's retrograde rotation). The projection of the map makes Ishtar Terra appear much larger than it really is"it is actually about the same size as Australia.
The question of how Venus came to have a slow, retrograde rotation was a major puzzle for scientists when the planet's rotation period was first measured.
Like Venus and Uranus, Pluto actually rotates in the opposite direction (retrograde rotation) from most of the other planets. Pluto is locked in a 3:2 resonance orbit with Neptune (where its orbital period is exactly 1.5 times longer than Neptune's).
The difference in rotational periods of Earth and Mars causes an illusory retrograde rotation. So, a particular feature will appear to back up about ~10° each night at the same observing time.
16 days, but the earth should have no business exerting an significant torques on Venus. Retrograde rotation may be an accident of birth, although it is possible that atmospheric tides produce a retrograde torque.
Mariner 2 discovered that Venus had a slow retrograde rotation and no detectable magnetic field.
Collisions of these giant planetesimals with the planets would have had dramatic effects and could have produced anomalies such as the strangely high density of Mercury and the retrograde rotation of Venus and could have formed the Moon.
 See also: Rotation, Orbit, Earth, Period, Time
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