Let's proceed from the assumption that the Moon is a globe. Numerous spacecraft have been documented to orbit it, men have
been documented to land on it, we have photos of the far side. So let's take that as a starting point.
This is a spherical wedge;
https://en.wikipedia.org/wiki/Spherical_wedgeDivide the globe up into four 90-degree wedges, and divide each at
the 'equator' to make four 'northern' wedge halves, and four 'southern'. With me so far?
At the surface, name the points where the arc of each wedge begins and ends.
I suggest the four points around the 'equator' be named 0, 90, 180, and 270 (running counter-clockwise when viewed from above), with the 'pole' points named 90N and 90S; this retains some commonality with textbook latitude and longitude indicators.
Now, if you hang this globe from the ceiling, with 0 toward you at your starting point, 90N to the top, and you remain upright, you see;
(whether you can see 90N or not will depend on how far below it you are)
If you are directly under this globe, you see;
(The arrow indicates the direction you are moving in)
And once you have moved to the other side (and you have turned round to face back toward it), you see
Yes? No?
Points to note;
At your starting point, you cannot see 180. Y/N?
At your midpoint, you cannot see 90N Y/N?
At your finish point, you cannot see 0 Y/N?