Donald wrote:Thanks, Ruud66

You're very welcome.

To expand on your original post:

The Placidus houses is just as much a compromise in the way it models the diurnal motion as all other house systems. The Placidus system focuses so much on the astronomical time cycles that it breaks all the laws of Sacred Geometry and at the core of its design it is agnostic about the ecliptic.

House systems that focus on the diurnal motion of the ecliptic itself are Whole Sign and Equal houses, and to a lesser extend Porphyry.
House systems that try to apply the rules of Sacred Geometry by using only great circles are mainly Campanus and Regiomontanus.
Most other house systems are more of a mixed bag.

As Paul is saying: "... no house system can model everything all at once with equal weight."