wiki:

"Egyptologists believe that the pyramid was built as a tomb for fourth dynasty Egyptian Pharaoh Khufu (Cheops in Greek) over an approximately 20 year period concluding around 2560 BC."

2560 to 2549 is 11 years. I have found geodetic alignments that cluster around the time period 2550 to 2556 BC.

An important factor is that a nominal 45 degree South King Chamber Khufu shaft(Gantenbrink) aligns with Alnilam the year 2554 BC.

The time difference here on a cosmological scale is very small, so we can consider it a perfect match.

At 2600 BC we have:

HIP48331 altitude at transit(South) = 31.4567°
Thuban altitude at transit(North) = 31.0891°

This star can explain a lot of things. It has an apparent magnitude of 7.65 so it is not visible by naked eye. The architects of these pyramids had very advanced knowledge of astronomy.