def set_park_coordinates(self, ha=-170 * u.degree, dec=-10 * u.degree):
        """ Calculates the RA-Dec for the the park position.

        This method returns a location that points the optics of the unit down toward the ground.

        The RA is calculated from subtracting the desired hourangle from the local sidereal time. This requires
        a proper location be set.

        Note:
            Mounts usually don't like to track or slew below the horizon so this will most likely require a
            configuration item be set on the mount itself.

        Args:
            ha (Optional[astropy.units.degree]): Hourangle of desired parking position. Defaults to -165 degrees
            dec (Optional[astropy.units.degree]): Declination of desired parking position. Defaults to -165 degrees

        Returns:
            park_skycoord (astropy.coordinates.SkyCoord): A SkyCoord object representing current parking position.
        """
        self.logger.debug('Setting park position')

        park_time = current_time()
        park_time.location = self.location

        lst = park_time.sidereal_time('apparent')
        self.logger.debug("LST: {}".format(lst))
        self.logger.debug("HA: {}".format(ha))

        ra = ha - lst
        self.logger.debug("RA: {}".format(ra))
        self.logger.debug("Dec: {}".format(dec))

        self._park_coordinates = SkyCoord(ra, dec)

        self.logger.info("Park Coordinates RA-Dec: {}".format(self._park_coordinates))
dataset/ETHPy150Open panoptes/POCS/panoptes/mount/mount.py/AbstractMount.set_park_coordinates/swapped operands of `-`