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The direction that the hands of current clocks follow came with the first clocks in the world, the sundials, around 5000 BC Despite not having hands, they marked the hours through the shadow projected by a rod at the base of the clock. And this shadow rotated from left to right. This happened because sundials had been invented in the northern hemisphere, in Babylon, the current region of Iraq. In the northern part of the Earth, because of the planet’s natural tilt, the Sun runs from east to south, and from south to west, casting shadows, respectively, from west to north, from north to east – that is, in the sense that we call time today. As mechanical clocks, invented around the 14th century, also appeared in the northern hemisphere, in Europe, the hands followed the same logic as the sundial, moving from left to right. But there are clocks that turn in the opposite direction: in Prague, for example, there is a Jewish clock on top of a tower that goes around the other way. :-S