def lin_parallaxE_lon_lat(delta_ups, ups, lon, lat):
    """
    Eq. 4.14
    Linear approximation of the parallax error as a function of the elevated
    target's longitude and latitude

    Parameters
    ------------
    delta_ups : float
        Parallax error, in km

    ups : float
        SSP distance angle, in degrees

    lon : float
        Elevated target's longitude coordinate, in degrees

    lat : float
        Elevated target's latitude coordinate, in degrees

    Returns
    ------------
    tuple containing 2 floats
    [0] = the longitude parallax error
    [1] = the latitude parallax error
    """
    delta_lon = lon * (delta_ups / ups)
    delta_lat = lat * (delta_ups / ups)

    return (delta_lon, delta_lat)