def sexagesimal_format(number_decimal):
    """
    Return the time or angle number in sexagesimal format.
    ___
    INPUT:
    number_decimal: number in decimal format

    OUTPUT:
    number in sexagesimal format.
    """
    N1 = int(number_decimal)
    N2 = int((number_decimal - N1)*60.)
    N3 = (((number_decimal - N1)*60.) - N2)*60.
    return str(N1)+':'+str(N2)+':'+str(N3)