Georeferencing a map of the pyramid complex of Djedefre, wrestling with inaccuracies, residuals and RMSE.

Georeferencing a map of the pyramid complex of Djedefre, wrestling with inaccuracies, residuals and RMSE.
What makes georeferencing historic maps difficult and how does the process work? Here I georeference a problematic map of Abu Rawash, pyramid and cemeteries, Egypt.
Satellite imagery is very precise but can still exhibit parallax. This is a particular issue for georeferencing historic maps, demonstrated here with reference to the Giza Pyramids.
How do archaeologists relate historic maps and plans to modern satellite imagery and maps? This post and video shows how a historic map of mastaba cemetery F at Abu Rawash, Egypt was georeferenced with ArcGIS.