def _set_domain_corner(ypoints, xpoints, grid_spacing):
    """
    Set domain corner to create a grid around 0,0.

    Returns:
        Tuple[float, float]:
            (y,x) values of the bottom left corner of the domain
    """
    y_start = 0 - ((ypoints - 1) * grid_spacing) / 2
    x_start = 0 - ((xpoints - 1) * grid_spacing) / 2

    return y_start, x_start