code: def optimal_orientation(self, t_gps):
          
          ra = self.longitude + (self.gmst_estimate(t_gps) % (2.0*np.pi))
          dec = self.latitude
          return ra, dec
docs: Return the optimal orientation in right ascension and declination
             for a given GPS time.
  
          Parameters
          ----------
          t_gps: float
              Time in gps seconds
  
          Returns
          -------
          ra: float
              Right ascension that is optimally oriented for the detector
          dec: float
              Declination that is optimally oriented for the detector