Sun-Moon Flat Earth Astrolabe

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Added static historical flight paths as optional overlays on both the AE and "normal" map as they are fascinating to compare. Did a huge number of other fixes, changes, optimisations etc. The larger file is for the flight path data.

Fixes. Added sun visibility limit circle (green line) to aerial view. I matched it exactly at one latitude but doesn't work precisely for all, showing they have a distorted projection in the Google map. :)