>>1) The pyramids were built by humans and only humans.
2) They were not aware that Neptune existed and therefore, on their own, could have no concept of it's alignment.
3) There was no intervention by advanced galactic civilizations. Zip. None.<<
Trying to explain phenomena via the use of hypothetical ideas that you cannot prove lead nowhere.

>>4) I base this on an advanced civilization being able to introduce such items as advanced flood control (like Aswan), advanced crop rotation, disease resistant food crops, a cure for arthritis and joint damage, etc. HAD such a civilization existed they would have introduced these basic staples to help everyone long before they introduced advanced build technology to help one man achieve eternal rememberance.
5) Since none of these advancements were introduced the advanced galactic civilization becomes a daydream.<<
I presented in the past various possibilities of who the designers of the pyramids could be. If you go over them you will see that the above argument has no base. I never referred to another Earthly civilization that simply came from another part of the Earth. Taking one possibility you cannot guarantee that every alien race is humanistic, or in any disposition to stay around for centuries and help out. Also are you implying that we do not find advanced scientific techniques at ancient times – like successful brain surgery?

>>6) There are events we do not understand that could coincide with the pyramid construction. As an example, as an example, imagine a large visible comet is discovered that circles the sun every 1,015 years. Imagine it's due back here in 2010ce.
As soon as one of us worked out it was in the night sky in 2055bce, it would become part of the "why they built it lore". And heaven help us if the course through the heavens was the precise angle of the East and west sides. What's the difference in this fantasy? The AE COULD have seen the imaginary comet, but not Neptune.<<
Yes, just one celestial body you say. And what was it’s diameter, was this also encoded? What was so special about this comet – I mean a celestial body this small how can it affect the Earth’s rotation? Was it encoded in various religions? Where do we have a cycle concerning more than one celestial body – this has only one. Why encode this and not another comet. I am not saying that just because by pure chance Khufu lived at the particular time he did – he observed the sky and then built the pyramids, what I say is that some”body” studied the morphology of our Solar system and determined the perfect time to construct a whole array of buildings holding astronomic knowledge. Of course the physical construction was performed by the Egyptians and other cultures around the world. The comet theory is not at all convincing if you put down what is encoded and compute the statistics.