Roger Sinnott wrote: > Duane, > > In addition to all the other comments, I'd like to mention this possibility: > > [F]or a sundial Poncet's original design seems quite adequate. All you would > need is a cam of the proper shape to raise or lower one end of the table (by > no more than 4 degrees) to correct for the equation of time. > > Using a knob attached to this cam, you could dial in the current month and > day and that's it! (And if you forget to reset the date for a week or two, > the readings will still be quite close.) > > -- Roger > Nice idea, Roger! A variant on that would be to use a long, straight shaft for the polar axis and gnomon, letting the horizontal dial hang from the axis. The adjustment would be very slight, barely noticeable as off-level...
Dave --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
