Venus rotates approximately 6.5 km an hour Earth rotates approximately 1650 km/h how fast could we speed up Venus's rotation via only weather manipulation ( maybe a giant fractal lens between Venus and the Sun at a gravitationally equilibrium point, the lens redirecting all the energy hitting Venus shifting it so as to heat one portion, while shadowing the others, in such a way to create a belt of wind circling the equator) there was a Report recently showing the alteration of the planet Venus rotational Time. http://www.esa.int/esaSC/SEM0TLSXXXG_index_0.html at 90 PSI density atmosphere that much energy available, how long would it take for the frictional energy of the atmosphere to speed up the rotation of Venus to the Earth equivalent?
[Physics] Altering Venus rotational speed to match Earth’s via weather manipulation
atmospheric scienceplanetsrotational-dynamicsweather
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There is a lovely presentation by Terence Tao of UCLA, The Cosmic Distance Ladder, that explains this, and much, much more, in detail. Here's a youtube of it, and here are the slides he used.
As a brief summary, to measure Earth's velocity, you need to know the distance to the Sun, plus its orbital period of 1 year. The earliest method to do so is due to Aristarchus, and was based on the half moon not happening exactly midway between the full and new moons. It required knowing the Earth-Moon distance, which required knowing the Moon size, which required knowing the Earth size, hence the distance ladder.
I won't spoil the fun of reading/watching it by trying to reproduce any more of it here.
The short answer is -- there are bands! They behave very similar to the bands on Jupiter, but are not as pronounced. And we don't have a really unappealing colored atmosphere to show us what the bands look like.
Here is an example of what they look like (source):
There are two bands along each side of the equator. Another set of bands starts 30 degrees north and south of the equator. And another band starts 30 degrees further north and south (at 60 degrees total).
You'll also note that these differences in wind in the same direction of rotation also causes wind to form in the north-south direction. All of this is what drives the major weather systems.
Consider the US. Weather systems will typically move from west to east. Atlantic hurricanes form in the tropical band off the coast of Africa. They form here because the wind is relatively calm and there is little north/south shearing. They then move westward in the tropical band while also moving north due to the Coriolis forces. As they move north, they begin to encounter the westerly winds that are characteristic of the mid-latitude cell. This will eventually turn them around so they move north-east along the US coastline until turning due-east and moving towards Europe (which in turn induces a southward drift due to Coriolis forces).
Here are what several of these hurricane paths look like (source):
These bands are not typically readily apparent. Mostly this is because our atmosphere is transparent so we have no way to "visualize" the bands. It is possible to sometimes capture bands however. A band of rainfall in the intertropical convergence zone around the equator is captured in this GOES satellite image (source):
Also, these bands are climatological features and not meteorological features. This means their structure is not always apparent instantaneously but appear in a time-averaged view of the atmosphere. It turns out that NOAA released a time-lapsed video of 10 years worth of GOES-12 images and the bands become pretty apparent!
@DavidHammen found another great video looking at the infrared signature caused by water vapor in the air by the GOES-13 satellite shows the bands better than looking at the visible cloud cover.
Best Answer
Using data from here, increasing Venus' rotational speed to match Earth's would require about $\:\mathrm{1.5\times 10^{29}\ J}$.
It's insolation is about $\:\mathrm{3\times 10^{17}\ W}$, so assuming that somehow all this energy could be transferred to rotation, it would take about 16000 years - not absurdly long actually.