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--- Begin Message ---I thought about this briefly. I had always thought that the purpose of the shim or wedge adjustment was to tip the dial north or south so that dial is at the latitude it was originally designed for. If the original dial has a built-in longitude correction, that could also be factored into a wedge which would have both a north-south and east-west axis. But a wedge would not work if it moved the gnomon out of alignment with the with the rotation of the earth (or the celestial sphere). I think a longitudinal adjustment would only work if he original dial had a time-zone offset included by rotating the hour lines with respect to the origin of the gnomon. Does this make sense? It sounds like a good project for a 3-D printer. Jack From: sundial <[email protected]> On Behalf Of Steve Lelievre Sent: Sunday, April 2, 2023 5:16 PM To: Michael Ossipoff <[email protected]> Cc: Sundial List <[email protected]> Subject: Re: Adjusting dial to new location Michael, Yes, I recognize that to get Mean Time involves Equation of Time adjustment and that Equation of Longitude can be handled there to give Standard Time (or DST). But anyway, my inquiry was to seek an online wedge calculator. Nobody identified one and a week seemed an adequate wait for responses, so I've just written one. Anyone who's interested, please see https://sundials.org/index.php/teachers-corner/sundial-construction/367-easy-dial-adjustment-for-your-latitude Cheers, Steve On 2023-04-02 1:41 p.m., Michael Ossipoff wrote: I just want to mention that the shim under the north or south edge of the dial is only for latitude. Longitude is corrected-for by changing the constant term of the Sundial-Time to Clock-Time conversion. But usually Sundial-Time, Local True Solar Time, is what I’d want from a sundial. On Sun, Mar 26, 2023 at 14:30 Steve Lelievre <[email protected] <mailto:[email protected]> > wrote: Hi, Can anyone point me to an existing online calculator for making a wedge to adjust a horizontal dial to a new latitude and longitude? I am not asking for an explanation of how to do the calculation; I just want to be able to point people to a calculator that has already been proved on the internet. It should use the original location (latitude and longitude) and the new location to calculate the angle of slope of the wedge and the required rotation from the meridian. Many thanks, Steve --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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