FUNCTION: pangle,theta,phi,b_theta,b_phi PURPOSE: Computes pitch angle given two sets of theta and phi INPUT: theta,phi: double (array or scaler) first directions b_theta,b_phi : double (array or scaler) second directions RETURNS: pitch angle (array or scaler) same dimensions as theta and phi CREATED BY: Davin Larson LAST MODIFICATION: @(#)pangle.pro 1.4 95/11/28