Years of the planets

1
Good evening,

Could a fellow forum member kindly direct me to authoritative texts explaining in detail the calculations of the 'least, greater and greatest years of the planets', ex gr. the 'greater years' being Saturn 57, Jupiter 79, Mars 66, Sun 120, Venus 82, Mercury 76 and Moon 108. The total of the non-luminaries is 360.

Thanks and best regards,

lihin
Non esse nihil non est.

Closed iterative circle of definitions?

3
Good morning,

Thank you, Mr Favro. In the article you reference by Mr Robert Hand, one reads:
"The great periods are not derived from actual astronomical cycles, but are the sums of the degrees allocated to each planet in both the system of terms according to the Egyptians and that of Ptolemy, at least for the planets."
If there is no astronomical validation or foundation for the great periods, have we a closed iterative circle of definitions, namely 'great periods' and 'planet totals of confines'? Can one perhaps understand the Renaissance astrologer Monsieur Jean-Baptiste Morin de Villefranche's rejection of the confines as having no basis in the skies?

However, the 'Chaldean' system of confines does not exhibit the problems underpinning the other two, Egyptian and Ptolemaic and, in contrast to the Ptolemaic, there are no controversies about the 'correct' version.

Best regards,

lihin
Non esse nihil non est.