Directing according Valens and Ptolemy: ascensional times against semiarc

In this short post I’ d like to compare the main methods of directing in Hellenistic astrology. Many have already explained this subject (( see for example  Martin Gansten, in Balbillus and aphesis in Greek, Roman, and Byzantine Studies, n. 52 (2012) )) but it can be useful to recapitulate the matter.

CLAUDIUS PTOLEMY’ METHOD
Ptolemy does not use the Hellenistic method but a method  which it is differentiated according the position of the point.

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