Semiarc and Alchabitius directions

The subject of semiarc vs. alcabitius method of directing has been discussed since many years (( see above all Kolev and Gansten )).It’s very easy (quite easy at least) to show as the two methods are just one, and we will repeat the experiment here taking our example from Quadripartite, III, 10 (your gentle writer has read the Italian translation cura Prof. Giuseppe Bezza).

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An election of the Coronation for the Duke of Mantua by Giovanni Antonio Magini

As wrote in the previous post about Laura Malinverni’s lecture in Genova (( see  here )) Renaissance astrology is  my favorite field of study, because we can see how real astrology 🙂 worked and how Hellenistic and Medieval techniques were applied in practice, included differences and interpretations of Sacred Astrological Texts.