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Comment on Earth rotation limits in-body image stabilization to 6.3 stops (2020)parent

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Realistically GPS is the answer, but it’s notable that you could also use a simple light sensor combined with accurate clocks to get your position on earth:

https://en.m.wikipedia.org/wiki/Light_level_geolocator

Recording light levels over time Wonder how much time is needed to determine location.

You just need to determine the time of sunrise and sunset relative to a known location and you get a rough idea of latitude and longitude.

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