def precession_matrix_Capitaine(fromepoch, toepoch):
 mat_fromto2000 = matrix_transpose(_precess_from_J2000_Capitaine(fromepoch.jyear))
 mat_2000toto = _precess_from_J2000_Capitaine(toepoch.jyear)
 return np.dot(mat_2000toto, mat_fromto2000)

def precession_matrix_Capitaine ( fromepoch , toepoch ) : mat_fromto2000 = matrix_transpose ( _precess_from_J2000_Capitaine ( fromepoch . jyear ) ) mat_2000toto = _precess_from_J2000_Capitaine ( toepoch . jyear ) return np . dot ( mat_2000toto , mat_fromto2000 )
computes the precession matrix from one julian epoch to another .