Re: Harold E. Brandmaier?

[Anselmo P�rez Serrada]

I'd like to ask you about your book on matricial gnomonics, its prize and
how to get it. I use Fer de Vries' matrix algorithm to calculate any planar
sundial, and I believe it's a perfect method to implement into computers.
I suppose you've extended his method, don't you? and I'd like to see
how you did it.

By the way, have you tried to do the matrix calculations through
quaternions?
The calculations are quite cumbersome, but very straightforward and concise.

Best regards,

Anselmo


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