You have reffered to other culminations/alignments , for example Sirius, Orion belt stars, Galactic center, etc. Did you compute these the same way? If so do these also have similar (time-altitude) variations in regards to what Starry Night presents?
Using my theory I find a descending passageway alignment with SN of 26.417°.
The descending passageway measures:
Lane = 26.5°
Vyse = 26.683°
Smyth = 26.45°
Edwards = 26.523°
Rutherford = 26.303°
The above data is from Athanasios Aggelopoulos book “Cheops – The Great Architect”. I have also found other more important alignments and its difficult for me to consider them a coincidence due to incorrect (I mean to a large degree) calculation on the part of SN.
Anyway lets see what SNs answer is.