That may be a decent "hack" approach, but more generally you should use distributions meant to operate on circles, eg. von Mises (analagous to Gaussians): http:

That may be a decent "hack" approach, but more generally you should use distributions meant to operate on circles, eg. von Mises (analagous to Gaussians): http://en.wikipedia.org/wiki/Von_Mises_distribution http://en.wikipedia.org/wiki/Von_Mises_distribution