In mathematics, the running angle is the angle of consecutive vectors ${\displaystyle (Xt,Yt)}$ with respect to the base line, i.e.

${\displaystyle \phi (t)=\arctan \left({\frac {\Delta Yt}{\Delta Xt}}\right).}$

Usually, it is more informative to compute it using a four-quadrant version of the arctan function in a mathematical software library.

• Differential geometry
• Polar distribution

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