Time Indicators

What are we to make of this implied circle around the Giza pyramid field? What clues might this implied circle present to us that might help us to uncover its purpose? Naturally the most obvious thing we can do in order to answer this question would be to measure the circle's properties. In so doing it might be possible, if significant values are found, to be able to determine the circle's purpose. And, intriguingly, after measuring this circle, this is what we find:

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