Horizontal sun and moon dial for latitude 46° North. It has an octagonal dial-plate with a rectangular extension for the compass on one side. The dial-plate has an outer circular lunar age scale inside of which is a rotatable disc with an hour scale. The date '1577' is engraved in the remainder of the hour circle. The disc is pierced by a circle allowing a pictorial representation of the moon's phase (with a human face on full moon and at quarters). The gnomon is hinged and folds flat when not in use. The compass, on a decorated extension arm, has no markings apart from two crudely drawn lines perhaps indicating magnetic variation (15° East of North and 15° West of North).

A similar instrument, dated 1580, is in the Whipple collection (Wh: 1215) and Zinner (1956) illustrates another (plate 36, 2), dated 1576, which was then in the Zeiss collection in Jena. These are both given as German, but it is difficult to identify a definite country of origin for these instruments.

For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.