xkcd Geohashing
http://wiki.xkcd.com/geohashing/Main_Page
XKCD comic #426 contains an algorithm that generates random coordinates across the graticule every day.
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http://carabiner.peeron.com/xkcd/map/map.html?date=2024-04-23&lat=46&long=14&zoom=8&abs=-1
2024-04-23: 46.623871 14.713012
Latitude: 46.62387129830972 <br />Longitude: 14.71301234214048
46.62387129830972 14.71301234214048
Tue, Apr 23 2024 15:30:00 +0100
9fb60787273fd927b687fa132342a4b0
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http://carabiner.peeron.com/xkcd/map/map.html?date=2024-04-22&lat=46&long=14&zoom=8&abs=-1
2024-04-22: 46.173745 14.473355
Latitude: 46.17374496130296 <br />Longitude: 14.4733551760164
46.17374496130296 14.4733551760164
Mon, Apr 22 2024 15:30:00 +0100
2c7a8cbea419b6f4792dce0861fd0bb3
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http://carabiner.peeron.com/xkcd/map/map.html?date=2024-04-21&lat=46&long=14&zoom=8&abs=-1
2024-04-21: 46.244858 14.747293
Latitude: 46.24485823404803 <br />Longitude: 14.74729271594485
46.24485823404803 14.74729271594485
Sun, Apr 21 2024 15:30:00 +0100
3eaf077b6480a195bf4e934f85aa1ef7
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http://carabiner.peeron.com/xkcd/map/map.html?date=2024-04-20&lat=46&long=14&zoom=8&abs=-1
2024-04-20: 46.982295 14.916327
Latitude: 46.98229481281855 <br />Longitude: 14.91632676921081
46.98229481281855 14.91632676921081
Sat, Apr 20 2024 15:30:00 +0100
fb77ac40160ad131ea94642235b30bb0