Analogies in the measuring systems
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1. a plane that expands from its centre in the form of a circle, making visible its circumference somewhere in its surrounding space,
2. a central axis starting out from the center, perpendicular to the aforementioned plane, forming a virtual North and South Pole above and below the center (the point of observation).
3. a projection arc that is drawn from both Polar points, passing through the celestial body in question and indicating its coordinates (P) at the circumference of the plane.
The coordinates of celestial bodies are taken from the graduation scale on the circle’s circumference as well as from that on the projection arc, measured in degrees.
For example, looking at the setup of the Horizon system, we encounter these three elements in the form of:
- the plane of the system’s circumference, the Horizon plane, which is the plane on which we stand at that moment,
- the projection arc is the Meridian (the time circle) of the place we find ourselves at.
With the information contained in the addendum, I trust that you can familiarize yourself with these three systems sufficiently to be able to follow the upcoming analogical (that is, more intuitive) discussion of these systems.