(As I said earlier, my #21 & # 34 on my "RAW VIDEO" thread show how I use that "forked" cloud as a temporal benchmark.)
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1) The contrail has extended well beyond my "forked index cloud", which is now right on the (shadow) horizon.
2) Even though the copter is well south of Warren's apartment, the contrail has drifted far enough south that it has the "leftward lean" typical of views of it from the north. (Clear indication that it is headed East, of course.)
3) The A/C has long since stopped producing persistent contrail; it should be in the vicinity of Catalina -- or, even, approaching "feet dry"...
I think we will have better luck with other means of triangulation.