def strike2dip_direction(strike):
    """
    Converts a planar measurement of strike using the right-hand-rule into the
    dip direction (i.e. the direction that the plane dips).

    Parameters
    ----------
    strike : number or string
        The strike direction of the plane in degrees. This can be either a
        numerical azimuth in the 0-360 range or a string representing a quadrant
        measurement (e.g. N30W).

    Returns
    -------
    azimuth : number
        The dip direction of the plane in degrees (0-360).
    """
    strike = parse_azimuth(strike)
    dip_direction = strike + 90
    if dip_direction > 360:
        dip_direction -= 360
    return dip_direction
Converts a planar measurement of strike using the right-hand-rule into the
    dip direction (i.e. the direction that the plane dips).

    Parameters
    ----------
    strike : number or string
        The strike direction of the plane in degrees. This can be either a
        numerical azimuth in the 0-360 range or a string representing a quadrant
        measurement (e.g. N30W).

    Returns
    -------
    azimuth : number
        The dip direction of the plane in degrees (0-360).