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Hidden radian units

50 bytes removed, 13:53, 22 September 2015
→‎Spherical harmonics: Fix for the symbols in the text.
</math>
where <math alt="theta''θ(t)">\theta(t)</math> '' and <math alt="phi''ϕ(t)">\phi(t)</math> '' are the time dependent spherical angles in the dimensionless radian units. The time ''t '' is normal time and hence has no hidden radian units. Spherical harmonics are the angular portion of the solution to Laplace's equation and, because it is angular, it is using the radian angular SI unit.  
== Rotational correlation times ==
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