Re: [Phys-L] globe sundials
An illustration similar to this, from a Junior High (pre-Sputnik) Science Book
is what got me interested in Sun Things.
> On Mar 9, 2024, at 1:51 PM, John Denker via Phys-l <phys-l@mail.phys-l.org>
> wrote:
>
> Hi --
>
> Maybe I'm the only one to not know about this, but I only recently found
> out about globe sundials. They are very much niftier than the old fashioned
> "gnomon plus flat plate" style, or even the fancier "equatorial" style.
>
> They have been around for quite a while. Thomas Jefferson installed one
> at Monticello. The one that's there now is a reproduction of a long-lost
> original, installed in 2001, so if you visited before then don't blame
> yourself for not noticing it.
>
> https://www.academia.edu/110730076/Visualization_on_the_Day_Night_Year_Globe
>
> It captures vastly more of the physics.
>
> Among other things, in mid-summer you can use a globe sundial for 16 hours
> a day in Bellingham, or 24 hours a day in Murmansk. That's in contrast to
> old-style sundials, which are good for at most 12 hours a day
> There are a couple of different versions: one with pins, and one with a
> movable vane.
>
> I don't know where to buy such a thing, but you could easily make one.
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