TIL: light level geolocator (or global location sensor, GLS). tiny device that you can stick on an animal (like a migratory bird). records ambient light level and the time. later you get it back and read out the data. time between dawn and dusk gives you latitude; offset of mid-day from UTC noon gives you longitude. no GPS or transmission capability needed. really neat! https://en.wikipedia.org/wiki/Light_level_geolocator?wprov=sfla1
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