Globalhash

From Geohashing
(Redirected from Globalhash achievement)
Globalhash.png
Reaching a globalhash may be very challenging, even if it does fall near your graticule.

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Globalhash.png
 This user earned the Globalhash achievement
by reaching the globalhash for [[{{{date}}} global|{{{date}}}]].

The decimals generated by the geohashing algorithm can also be used to generate a single point on the globe instead of one for each graticule and this award celebrates those lucky or mad enough to pursue that single point.

To generate this point take the east-of-30-degrees-west decimals for a date (to make it global) and multiply the latitude by 180 and subtract 90, and the longitude by 360 subtracting 180. This will generate a single point on the globe which is today's only globalhash.

Proof is the same as any hash, but at the single day's coordinates. Good luck! The odds of the globalhash falling in your graticule are 1 in 64,800!


-21.532025606551,-170.871667554630

Globalcule

You can think of the entire surface of the Earth as comprising an analogous mathematical structure to the graticule, but much larger -- the globalcule! Every geohasher calls the globalcule their home (so far). The globalcule is bounded on the east and west sides by the antimeridian, to the north by the North Pole and to the south by the South Pole (the latter two a Mercator or similar projection shows as lines, but of course they are points; spherical geometry and all that). It has a vast area, made even vaster by the fact that it is not smooth (which of course makes the diminutive -cule in the name ironic). Most globalhashes in the globalcule would require the conditions for a water geohash achievement if completed.

Example

For 27 May 2005 (the day after the xkcd 426 comic date), the Dow open was 10537.08 (https://data.geohashing.info/dow/2005/05/27), so the W30-rule-modified-algorithm gave us the fractions 0.3465 and 0.07437 for latitude and longitude respectively (extra digits truncated thanks to https://data.geohashing.info/hash/2005/05/27). Multiply by the degrees in a globe and we see that the global hash is: 25.67229, 37.29761 (https://geohashing.info/t:map/2005-05-27) -- Tawala, Tabuk Region, in Saudi Arabia.

Locations

If you are using a map-based coordinate calculator, try zooming out to see the global point.

  • Hashpoint lists or overview maps requested with the Small Hash Inquiry Tool always include the globalhash of today and upcoming dates as available.
  • Eupeodes' map always has the globalhash on it, and can be made to display the subsequent known globalhashes by checking the box at lower left. As below, you may have to zoom out a lot to see it!
  • The geohashing coordinator always includes the globalhash for the selected date - you may have to zoom out to see it. On the other hand, if you see any second marker in or around your graticule, you know you've struck gold.
  • DAGAAG (Danatar's Approximate-Globalhash-At-A-Glance manual lookup map): If the online tool doesn't work and you want to avoid difficult calculations, just have a quick glance at the approximate location. Take the W30-adjusted coordinate offset (e.g. from the peeron map, but don't use American graticules) and compare it with the map using the black grid lines. If this gives a location at the other end of the world, you don't have to think about it any more, but if it is near you, you will have to use a calculator to get the exact location. See example here (for 2008-09-10 like in the other example above).

Winners

The following Geohashers have won this award, and have supplied proof.

Honorable mentions

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