In March 2001, I had a seven-page paper published in The Compendium, a gnomonics journal. Based on an idea of son M, I noted that one could create a sundial on the basis of a hologram. Yesterday I stumbled upon a paper of November 2017 -- sixteen years later -- which used a CD to provide a (kind of) hologram to display the time: CD Sundials. This is the first time that I see such an idea being implemented. OBSERVATION: But I noted in The Compendium that there were problems of alignment. It was a simple idea, but hard to use. I myself went on to solve all problems of alignment, but had to discard the hologram. My design, The Pastor's Watch, is a sundial which one can wear on the wrist (and a wrist has next to no alignment).
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