The Rotary Ring Calendar is a wall-mounted perpetual calendar made of three rotating rings. Each ring corresponds to a different unit of time:

• The outer ring marks the day of the month (1–31).
• The middle ring shows the months (January–December).
• The inner ring indicates the day of the week (Monday–Sunday).

By manually rotating the rings, the user aligns them under a central marker to display the current date. This mechanical and reusable system eliminates the need for disposable paper calendars, combining practicality with a visually striking design.

Perfect for offices, homes, or creative spaces, the Rotary Ring Calendar serves both as a functional organizer and as a decorative piece with a timeless, geometric aesthetic.