Aligning a Pyramid to a Star the Easy Way

The ancient techniques seem mystical at first until you understand the simplicity of the fundamental concept. What IS mystical is how this knowledge appeard out of knowhere across all civilizations, who were allegedly not in contact with each other, at a time when humanity barely survived the ice age.
Oh yeah and we had so much excess at that time we could build a "tomb" made of rocks as high as a skyscraper. Thats mystical.