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 ![Diptych Sundial Details](/sites/g/files/omnuum6316/files/chsi/files/diptych_top_bottom.jpg)

 

**Rectangular Ivory Diptych Sundial: Details**  
  
**The top face of the sundial when closed (left), showing the wind vane.  
A rotating disk on the underside (right), called a lunar volvelle, showed the age of the moon and enabled the user to find time by moonlight.**  
  
 **CHSI Inv. Number [7568](https://qrgo.page.link/7D9kQ)  
Date: 1636  
Leonhart Miller  
Nuremburg, Germany  
  
  
Back to ["Time, Life, & Matter: Colonial Science"](/exhibitions/tlm-colonial-science).**