up there and out there

"House system where great circle is passing through ascendant
and zenith ('Medium Coeli'). This circle is divided into 12
equal parts (1st cusp is ascendent, 10th cusp is zenith),
then resulting points are projected to ecliptic through
meridian circles."

In this definition:
- 'Medium Coeli' is assumed in its' original pre-ecliptic
  definition as point directly overhead, located upper square
  from ascendant, in modern times in astronomy called 'zenith';
- 'Meridian' is assumed as great circle passing through
  the north and south celestial poles in equatorial
  coordinates (perpendicular to equator).