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Although the original question referred to a
Although the original question referred to a vertical dial, for a
horizontal dial it works very well 6 months in the year on the pole, fairly
well as the latitude moves towards the equator, but does get progressively
less and less accurate.
Simon
On Tue, Nov 9, 2021 at 12:08 PM Dan-George Uza
Dear all,
In his book "Sundials Old and New", A. P. Herbert contends that rotating a
vertical dial by 15 degrees towards East (i.e. gnomon pointing 15 deg. West
of North) will switch it to Summer Time. Writing that this is against all
theory, but works quite well, he calls this "the housewife's
Dear John,
attached you will find a graph calculated at latitude 42 degrees N
for a vertical sundial mis-aligned by 1 degree toward West.
For 52,5 degrees the values are somewhat larger (by about 10 to 30%).
With greater mis-alignement (to some degrees) consider
that the values are roughtly
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It seems as though gnomonicists are like
John,
Unfortunately, I can't direct you to an existing tabulation of the
alignment errors on a vertical dial.
However, I do have a comment regarding your subordinate question about
average errors: in my experience of the world of work, it is always a
good thing to arrive on time or a little
dear John
there is a precise theoretical procedure to relocate a sundial so that
it works correctly in a new location (for the hour lines).
In the most general case, the sundial must be placed with a new
orientation so that the style keeps the polar orientation in the new
location (thinking
