This reminds of only learning about the existing of light level geolocation that uses only an accurate clock recording ambient light level to determine longitud

This reminds of only learning about the existing of light level geolocation that uses only an accurate clock recording ambient light level to determine longitude and latitude of migratory birds - https://en.wikipedia.org/wiki/Light_level_geolocator https://en.wikipedia.org/wiki/Light_level_geolocator