So it looks like I'm getting free Internet service while the company figures out exactly what services they are going to offer. I was looking forward to a period of being Internet free.
Mark,
I wrote:
. . . is a foundational influence of Hellenistic astrology.
You wrote:
. . . is one of the foundational influences of Hellenistic astrology. . .

Aren't we saying the same thing, my 'a' indicating that there were others? Thank you for naming other influences, but you forgot the Chaldean.
Deb,
I wasn't referring to any system. I was questioning such a strong focus on the midheaven ? perhaps meridian is a better word ? for the origin of 10th house significations. I was considering the possibility of an entrenched and favored ancient numerological idea in relation to the all-important Ascendant leading to 10th house meanings. The Ascendant was the 'hot spot' for the Greeks, and the idea of the 10th sign to rise there, bringing fulfillment, completion and success, seems quite plausible. Rather than looking at a high point in the center of the sky I was considering the development of ASC potential. Rather than looking back and forth between the ASC and MC, switching the focus between the horizon and the sky, I was staying with the ASC and wondering what formerly may have been seen to develop directly from it ? the 10th house as an outgrowth and completion of the ASC. There might be a chance that the two approaches came together and gave us the 10th house. But I ain't no expert.