The Sun god Ra and its sub-religions were worshipped for a longer time greater than the existence of Christianity, so I would think these societies worshipping an all-powerful deity which is based on our own solar system's star hadn't really conceptualized the presence of infinite space quite yet. Sure, they were aware of other stars and planets by just studying & looking at the sky, but could they know there were billions of other solar systems while highly celebrating our own sun, or Ra, and remain satisfied that Ra was the greatest power (deity) in existence. The only reason I bring this up is that if people thought that it was spacemen or extraterrestrials that were responsible for the highly technological engineering which created these monolithic structures, wouldn't a god other than a more localized Ra capture the imagination ? For thousands of years the sun was worshipped religiously, could it have been possible for an ancient but earthbound civilization to have created a sun (solar) powered laser which could cut stone so precisely ?
The sphinx, which originally had the head of a lion before a Pharoah later had it carved away to try and resemble his head, was built facing the constellation of Leo. The interesting thing about that... it was 10,000+ years ago when that constellation and the sphinx lined up that way since the constellations rotate around us basically in a big circle. That's a theory that many believe is proof that the Egyptians did not build the sphinx... they found it, and many years later a Pharoah laid his claim on it by remaking the head. 10,000+ years ago, the sphinx faced directly to the point on the horizon that the constellation of Leo rose into the sky... and it was a lion (head and all).
The three pyramids in Giza where built in positions to match the 3 stars of Orion's belt. There really is no denying that no matter who someone believes built them. Many of the amazing shafts in the pyramids line up to different stars outside of our solar system too.
I see what you're saying about the Egyptians and Ra. But the builders of the sphinx and the pyramids certainly didn't position those structures to celebrate or honor our sun/star... they were built in positions to honor stars completely outside of our solar system. Why would the sun worshipping Egyptians do that???... it really doesn't fit what they would have done.
I said this in an earlier post... but I'm not saying that it had to be aliens from far away that created or showed humans how to create those incredible ancient monolithic structures. It could have been technology that our ancient pre ice age human ancestors created all by themselves. The Ancient Astronaut theory is also one that many believe... but it's not the only theory that could explain how these structures that we really cannot create today with our "amazing" technology were created. It's a crazy unanswerable question still.
There is no question though about the builders of those structures in Giza being very in tune with stars that are no where near our sun or solar system that the Egyptians seemed to have worshipped as the #1 most important. The builders of those structures clearly had other stars that they considered to be much more important.