It definitely rotates. Or rather shifts. You can see it in this gif compiled from Day 0's activity.
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Not all of them rotate, a lot of them appear and then disappear. I think what is being seen there is a shift in the visits. The past two days we have expected a rotation and it has not been seen like this. I think on day 1 the hype was so much and the interest so high that there were just a steady stream of outlying views either from the north or south of the bulk of visits.
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So you think it's a coincidence that the top cluster roughly takes the shape of the US?
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That's not what I'm saying. I think it should take the shape of the US. I think that each person makes a dot on a map on Bungie's server. Then from each of those dots a vector is calculated representing direction and magnitude to every other dot. If only two people are on one in SF and one in Seattle you would see three dots. A single dot in the center one at the 12 o'clock position and one at the 6 o'clock position with the same length (the length would likely not be very large) because from each person to themselves the length is 0 but from SF to Seattle it's almost a straight north shot but in reference to the length of the world it isn't very far. So if someone in Greenland visited during a time at which someone in every major city in the US was active you would see (roughly) the shape of the US at 2 o'clock position and an upside down version of the US at the 8 o'clock position. If someone in Russia or Alaska did it you would see the US at 11 o'clock and 5 o'clock.