The Coriolis Effect is a concept in physics whereby a rocket which in truth flies straight up and straight down, appears to have a force causing it to fly in a curved path. This is caused by the Earth rotating beneath the rocket while in flight.

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Long term investments are very similar to the rocket; we may see the target when we make an investment, but there are so many things in constant motion in financial markets, that, without in-flight adjustments, our investments may not hit the target.