Hi Roger-- Thanks for the info. You answered my question about the first known Horizontal, Polar-Gnomon Dial.
On Thu, Jul 30, 2015 at 12:26 AM, Roger Bailey <rtbai...@telus.net> wrote: > . Meeting for lunch was no problem. > ...unless you're using a portable Altitude Dial. I've long felt that that's a big disadvantage of Altitude Dials--their inaccuracy around noon, just the time when people would make lunch appointments. Michael Ossipoff
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