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Welcome to the Vertical Sundial Calculator From these pages you can download some great-value software that will help you design a unique wall mounted (vertical) sundial for locations in the northern hemisphere and for any wall that faces up to 70-degrees away (declining) from due south.
Most sundials available from the high-street are floor mounted and it is often assumed that these will work anywhere. In reality this is not the case, as both the longitude and latitude will influence the design. For example, Penzance in Cornwall UK is 20-minutes behind Greenwich as the sun travels overhead and the hour markings will need to compensate for this. In a similar way, the gnomon (the bit that sticks out in front) must be aligned with the earth's rotational axis and this changes with Latitude. So
This software does all the calculations that you will need to allow you to build a vertical dial for any wall that faces up to 70-degrees away from due South. It takes into account your latitude and longitude to provide you with a highly accurate and unique timepiece. It is not possible to design a more accurate sundial.