Ah, yes, of course you're right; your stone dial is not an analemmatic dial,
but a horizontal dial with the hourly analemmas and declination and dates
among the dial furniture.
And, yes, I've also long been an admirer, too, of the simple analemmatic
dial painted on the sidewalk at the entrance to the Flandrau Planetarium.
That's Dave Harvey's production, although I think someone else has been
re-painting it periodically to renew the markings, just by re-pigmenting the
original divisions on the precise underlying layout made by Dave. The dial
is/was
not *so* simple (to calculate), really, since the sidewalk there is not
level, but is
pitched in order to route the runoff, etc., there. So, Dave had to
incorporate
the sidewalk's deviation from the horizontal in his design. Now, if only
the
gnomon were more precise (my head)! ;-)
By way of introduction, I'm a relative beginner at making dials, myself.
My dials are of the Polar type, and the Horizontal type; they are Standard
Time dials,
and they correct for the Eq'n of Time without need of recourse by the user
to tables, etc.
He/she has only to turn a ...dial. That's all I'd better say, now. Anyone
who has
"been there and done this-or-that" knows where I've had to "go" to do this.
It's
been fun, and keeps getting to be more so. We should install the first
successfully
completed one within a year, of semi-monumental size, of 6061-T6 aluminum,
anodized,
in the Samos Neighborhood Association area of Tucson (not coincidentally, my
own
neighborhood). Vandalism-proofing/protecting has been the most difficult
technical
challenge to overcome! I find that the simpler and more robust the
elements, the
better, in that regard and in almost all others.
With cheers,
--Joe
From: John Carmichael <[EMAIL PROTECTED]>
I remembered your email to the list long ago and the gist of its
contents, but I didn't remember your name. [snip]
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