Portable equatorial sundial 1761 - 1795

This portable equatorial sundial, made by German craftsman Andreas Vogler between 1761 and 1795, is a fine example of 18th-century scientific instrument making. The sundial features an octagonal base, a compass, and a hinged, engraved semicircle with Roman numeral markings and a central gnomon for casting shadows. Its small size makes it ideal for travel, allowing one to determine the time of day by observing the position of the sun.