Cup chalice or goblet sundial

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Cup, chalice or goblet sundial
Manufacturer	(unknown)
Production years	1596
Production location	(unknown)

This sundial is dated 1596 and is designed for use in a latitude of 420 (that of Rome).

[edit] How it works

The gnomon consists of a pointed rod forming the axis of the chalice, and the shadow of its tip falls on the hour-lines which are engraved on the inside of the vessel. There are three sets of hour-lines showing respectively Italian hours (1-24, starting from sunset), equal hours, and planetary’ or temporal hours dividing the sunrise to sunset period into 12 equal parts. To use the dial, it is rotated until the shadow of the gnomon falls in the sector corresponding to the month in question. The dial is provided with a small plumb-bob for leveling.

[edit] Memories

Do you remember stories about the Cup, chalice or goblet sundial? Add your memories.

[edit] In the Science Museum's Records

Inv. No: 1955-149