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=2025-04-04&lat=46&long=14&zoom=8&abs=-1
2025-04-04: 46.517901 14.093576
Latitude: 46.51790133064981 <br />Longitude: 14.093576318864031
46.51790133064981 14.093576318864031
Fri, Apr 4 2025 15:30:00 +0100
84952e7db221b60717f49e1d3379f539
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http://carabiner.peeron.com/xkcd/map/map.html?date=2025-04-03&lat=46&long=14&zoom=8&abs=-1
2025-04-03: 46.654979 14.469493
Latitude: 46.65497939084858 <br />Longitude: 14.46949303034475
46.65497939084858 14.46949303034475
Thu, Apr 3 2025 15:30:00 +0100
a7acbab73fa7751e7830b1fb07d71874
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http://carabiner.peeron.com/xkcd/map/map.html?date=2025-04-02&lat=46&long=14&zoom=8&abs=-1
2025-04-02: 46.053644 14.918475
Latitude: 46.053644089304044 <br />Longitude: 14.91847527321285
46.053644089304044 14.91847527321285
Wed, Apr 2 2025 15:30:00 +0100
0dbb9e792f402127eb21320ca2440863
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http://carabiner.peeron.com/xkcd/map/map.html?date=2025-04-01&lat=46&long=14&zoom=8&abs=-1
2025-04-01: 46.283782 14.078617
Latitude: 46.28378173737544 <br />Longitude: 14.078617247732683
46.28378173737544 14.078617247732683
Tue, Apr 1 2025 15:30:00 +0100
48a5eb813ac58b6a1420428be9d4b2ae