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RE: Flakfortet, Copenhagen (guest harbour, fortress island)
The even surface of the calm seas does provide a pretty good area to experiment on. The islands are close enough to be visible by the naked eye so one can do some rough calculations to get few preliminary results.
Did that, but the flat-earther claimed I would be able to see the "hidden" parts if I had used a camera with 60x zoom instead of a 6x50 binocular. To utilize 60x zoom, a steady triod and absolutely no waves seems to be a must.