At a new location, a dial must end up with the style parallel to the polar axis - but how do you achieve that using a wedge? Assuming you start with the dial at the new location on a horizontal surface with the sub-stile line on the local meridian, the required sequence is to rotate it about the local vertical, then about an east-west line, and then about the vertical again. Perhaps this helps visualize it... https://youtu.be/mtEgSXJPXSw
The wedge achieves the same thing because the twisting of the dial on the wedge face corresponds to the first rotation about a vertical, it's tip angle corresponds to the east-west rotation, and the turning of the wedge corresponds to the second rotation about the vertical.
Steve On 2023-04-04 11:59 a.m., Rod Wall wrote:
As Michael indicated in his email below: *Rotating the whole dial around the polar axis is the correct way. *to adjust a local solar time dial to a different longitude
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