Eeuwigdurende juliaanse kalender 1757 - 1777

This anonymous artwork titled "Eeuwigdurende juliaanse kalender" from 1757 to 1777 is a detailed circular chart that functions as a perpetual Julian calendar. The chart is printed in color and displays numerous concentric rings, each representing a different aspect of time, such as days, months, and years. The central square within the circle likely represents the present day, with the outer rings extending to represent future dates. This work is a testament to the fascination with timekeeping and mathematical precision in the 18th century.