Page:Organum mathematicum libris IX. explicatum (1668).djvu/520

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signum est, litteram septimam in ordine retrogrado, quae est A, esse litteram Dominicalem; quae ut habeatur in ordine directo, subtrahuntur 7 ex 8, remanet 1, quae est index litterae primae seu A in directo ordine.

Modus secundus, Per Tabulam.