Hi Chris,
My subconscious must have been gnawing away at this, because I've
just recollected a beautiful example of the very kind of dial you've
thought of. It was made by Dietrich Ahlers of Bremen and you can see
photos of it at:
http://planetarium.hs-bremen.de/planetarium/astroinfo/sonnenuhren/digitalk.htm#justieren
best wishes,
Peter
On 11/11/2010 06:58, Chris Dobbie wrote:
Just in the last week I’ve become fascinated with sundials and decided
to join this mailing list. This is my first post here and with that said
I’d like to say hello to all members and ask that you forgive my noobish
questions.
I saw a “digital” equatorial sundial for the first time the other day
and fell in love with its simple design, just a band of metal bolted to
a rock. I soon realized that its simplicity came with a cost to
functionality. I’ve since come up with a far less simple design that I
think solves most functionality problems including equation of time and
the inability of use between 6 pm and 6 am.
You can’t really tell from the model but I envision the equatorial ring
being able to rotate 360 degrees with markers along its track for
longitude and DST correction as well as current times for other cities
around the world. One could also make it universal by marking it in
degrees and making the base adjustable. If build large scale, minute
lines could be added to the analemma.
I’ve only recently started researching sundials and the math of the
analemma is still confusing me so I have a couple questions.I imagine if
I calculated out the amalemma and checked the time at noon this dial
would be fairly accurate but how accurate would it be at dawn and dusk?
Would the angels of the analemme change?Also, would rotating the
equatorial ring affect accuracy? If the dial does work and the amalemma
and dial were marked in smaller increments, how accurate do you think it
would be?
Lastly, I’m wondering if you have ever seen this style of dial before in
design or finished form? I have yet to come across one and would love to
see any pictures or info that’s out there. Thank you so very much for
any and all you can share with me.
Cheers,
Chris
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