The angular size z of the sectors is computed by the formula tan z = sin(latitude) · tan(τ), τ=n·15° Instructions Choose your location from the menu, or: enter (in decimal degrees) your latitude and press return key enter (in decimal degrees) your longitude and press return key Adjust the timezone offset Check the box "Insert Gnomon" Select "Show Hours" from the Details menu Copy the left pie circle by a screen capture tool and print Cut away the indicated sector Fold up the gnomon and glue the two halves together Set it up on a horizontal plane, the gnomon pointing to North (or South) Example: 51,5° North und 8° East 0n 2002, September 29 at 15:50 CEST The equation of time is about + 10 minutes, the sundial is fast at this amount. This sundial is made of brass: