Dear John,
at first I couldn't understand your question. Now, after reading several replies of other dialists, I think that I know what you meant.
Please have a look at the attachment.
Best wishes
Rolf Wieland
Gesendet: Montag, 08. November 2021 um 14:38 Uhr
Von: "John Foad" <[email protected]>
An: [email protected]
Betreff: A mis-aligned vertical dial
Von: "John Foad" <[email protected]>
An: [email protected]
Betreff: A mis-aligned vertical dial
If a vertical dial is relocated and now faces a few degrees east or west of its designed declination, you might expect it to run a few minutes slow or fast. Has anyone ever tabulated the greatest error, and at what times and dates it occurs? And does it make sense to think about the average error? Clearly the errors depend on the latitude and the design declination, but for starters they could be tabulated just for a direct south dial at 52.5 degrees N, and for a location move of 1, 2 and 5 degrees either way. As the gnomon is no longer polar-pointing I imagine the maths is a bit hairy.
Best wishes,
John Foad
ReadingErrors.pdf
Description: Adobe PDF document
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