Thank you for your research. This stuff has been driving me nuts for 20 years. We were driving up and down California a lot and it became obvious. We moved from So. Cal to get away from the smog (etc) but the sky was never clear, except at first they had holidays off. They often start with a giant X, probably to set a grid pattern for the session. This was researched by Clifford Carnicom, then Rosalind Peterson, and now Dane Wiggington has lots of data. This needs to be on Trump's "to do" list.