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I have a question concerning the Coriolis acceleration expression. I learnt it as Ac = -2

**ω**x

**v**, where

**ω**is the vector which indicates the rotation axis direction of Earth and

**v**the velocity of a body that I want to check the Coriolis effect on.

My question: where the minus sign comes from? As far as I understand, it depends on what reference frame I use (inertial or non inertial - the minus comes from the latter, like the Earth, in my conception). Am I correct?

Thanks in advance!