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A clean slate? (or should that be granite?)
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nigelswift
8112 posts

Re: A clean slate? (or should that be granite?)
May 03, 2011, 05:44
I've played around with home made sundials for years. I think if I wanted to mark midday (or any other time) in a really clear way I'd set up two very narrow, vertical gaps so that a pencil thin line of light would appear at the required time for just 2.5 minutes every day or (if you blocked part of them) at any desired time or day.
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