zoidsoft wrote:The circumambulations are the precursor to the semi-arc method of primary directing that Ptolemy espoused upon which later traditions reinterpreted Ptolemy creating such derivations as the circle of position and directing under the poles of varius planets, etc...

Let's say that without a software it's very difficult to calculate Ptolemy's directions.

On the other hand under-the-pole and Regiomontanian are very easy to calculate by hand, you need just to calculate the pole and voila, with whatever oblique ascension table you can calculate directions in seconds.

I can very easily understand why they were invented.

margherita wrote:Let's say that without a software it's very difficult to calculate Ptolemy's directions.

On the other hand under-the-pole and Regiomontanian are very easy to calculate by hand, you need just to calculate the pole and voila, with whatever oblique ascension table you can calculate directions in seconds.

I can very easily understand why they were invented.

Same thing with Placidus "under the pole" which is an approximation of the semi-arc method.

As for the semi-arc method, it was a tedious task finding what quadrant the promissor and significator were in, then deriving each of the NSA's and DSA's then finding the proportion, then adding all the different arcs depending upon which quadrant the moving point starts from and which point the fixed point is in. In this case there are 16 conditionals: one for the proportional point that is fixed and then 4 in each to finish the AOD (Arc of Direction). I did this wanting to have directions for thousands of years into the future for mundane astrology.

The calculation of the "rational method" is also much more programmer friendly.

I have finished the circle of position method (but not yet in Delphic Oracle). It is in a test app that I'm writing based upon Martin Gansten's primary directions course. I'm currently in Lesson 9 (Placidian innovations) and have added the calculation or mundane, rapt parallels and parallels of declination to the test application...

Zagata wrote:Hello ea and everyone,

P.S. Primary directions are not a time lord system, although they are very powerful. Directing through the terms is such.

Thanks for the correction. I actually meant directing through the terms when I wrote primary directions. That was sloppy writing of me. And thank you also for joining this thread, you've made some good points.

ea