The Holy Wise Man obtains his Wu wei as stated, by binding himself rigidly to the surface of the Earth. Despite its finiteness, this surface has no boundaries. Therefore, each spot on the surface of the Earth is by definition a centrally situated point.

So in principle, every spot on the globe is suitable for optimal observation.

The Holy Wise Man, however, is not only at the centre of the earth's surface, but also in the centre of an 'sphere of observation': The bottom half of that sphere is a segment of the earth's sphere, the upper half is space / the sky. So Wu wei indeed seems to be a state of optimal subjective observation.

To make the Holy Wise more contemporary, I call him the "Sphere Observer".

By assuming the afore-mentioned respectful attitude facing south, the Sphere Observer creates for himself a kind of 'reference frame'. This consists of two circles perpendicular to each other, one being the horizon of a segment of the earth’s sphere, the other one the circular path of the sun.
Through his position, the observational field of the Sphere Observer - the southern half of the earth’s sphere and the southern parts of the sky - is formally established. It is delimited by the EW axis, the southern horizon and the upper part of the sun's orbit.

Note 4 This situation only applies to the northern hemisphere of the Earth. For the southern hemisphere, the Sphere Observer should face north.

This way the observational field of the Sphere Observer is recorded in his frame of reference, and is very restricted. It is no more than a quarter of his sphere of observation. Under optimal conditions, the Sphere Observer can thus observe only a quarter of the total of reality in a subjective scientific way!

Notice now, that the Sphere Observer is actually abstracting himself in this way from what he observes. He does not accomplish this, however, by projecting his own motions on what he is observing, like the Western scientist, but by incorporating his motionlessness in the reference frame. His  frame of reference thus actually determines how he should view the world as a scientist (see 1.2.1).

In addition, the Sphere Observer has concluded that for his Wu wei, he must in fact be motionless with respect to everything existing in the universe. In that case, the Earth must be motionless in respect to everything as well.
If this is not the case, he has to consider it to be an additional limitation of his ability to observe in a subjective scientific way, which must then be implemented into his reference frame. If this proves to be impossible, the Sphere Observer must consider his exercise as a 'mission impossible'.

Continue to: Chapter 2. OPTIMIZING THE REFERENCE FRAME, 2.1. The reference frame for a stationary Earth