FIELD: determination by a woman of the periods of the personal physiologic cycle. SUBSTANCE: the calendar has two components - a supporting component and a movable one in the form of a disk. The components are made of solid material, for example, board or plastic. The movable component is installed for rotation and contains a calendar information of the ordinal number of the day for the 30-day and 31-day moths with grouped designations of the months according to their duration successively applied in the form of sectors. The supporting component contains the applied indicating information for different in duration physiologic menstrual cycles with the dates of duration of the cycle and the dates of the ordinal number of the cycle day, and the lines of correspondence of the ordinal number of the day of the physiological cycle with the day of the calendar month on the movable component, the zones of the menstrual physiological cycles and the beginning of the next menstrual physiologic cycle are marked on the supporting component for different in duration physiologic cycles. EFFECT: enhanced convenience in use. 3 dwg, 1 ex
