def light_travel_time_to_detector(self, det):
        """ Return the light travel time from this detector

        Parameters
        ----------
        det: Detector
            The other detector to determine the light travel time to.

        Returns
        -------
        time: float
            The light travel time in seconds
        """
        d = self.location - det.location
        return float(d.dot(d)**0.5 / constants.c.value)
Return the light travel time from this detector

        Parameters
        ----------
        det: Detector
            The other detector to determine the light travel time to.

        Returns
        -------
        time: float
            The light travel time in seconds