Note to PB: the first picture may have some relevance to the Michaelmas thread.
- Jim, may I ask where on the Newgrange line to Giza, where your Giza en-point was: eg, between the Sphinx and g2? That would seem relatively central. (Would the slope correlation change if your Giza target was the center of g1??
Also, Alexandria is a large city nowaydays. Does this line run through a place or structure of ancient consequence there?