Difference between revisions of "Time-traveller achievement"

Revision as of 14:14, 25 April 2016

This user earned the Time-traveller achievement

The achievement can be claimed if you venture to two or more geohashing locations on the same day and the same local time.

If you don't own a time-machine, you could ...

cross a time-zone border.
take advantage of the autumn daylight saving clocks change.
- Geohashers nearer the equator are at a disadvantage because they have further to travel east or west.
- Geohashers near longitude 0 or 180 might be lucky and not have to travel far at all.
get lucky.
- If, at the equator, the longitude is less than +/- 0.000036° you will be in the circle of uncertainty for two hashpoints simultaneously.
- The poles are singularities for 360 graticules!
- A similar effect applies at longitude +/- 179.999964°, but only at weekends.
- On weekdays hashpoints east and west of longitude 30°W are calculated separately, so may both be close to 30°W or 180°E/W.

Of course, as usual, you need to upload photos of yourself containing the necessary proof.

Woodveil was at the 2009-03-08 33 -84 and 2009-03-08 33 -85 hashes at 12:39 local time.

B2c and Patrizius were at the 2013-10-27 47 13 and 2013-10-27 47 12 hashes at 02:09 local time. It was a DST time travel.

Micsnare and B2c were at the 2014-10-26 47 14 and 2014-10-26 47 13 hashes at 02:01 local time. It was a DST time travel. Again ;)

@@ Line 14: / Line 14: @@
 * get lucky.
 ** If, at the equator, the longitude is less than +/- 0.000036° you will be in the circle of uncertainty for two hashpoints simultaneously.
-** Further from the equator this longitude can be calculated from 0.000036° / cos(Latitude). The poles are singularities!
+** The poles are singularities for 360 graticules!
 ** A similar effect applies at longitude +/- 179.999964°, but only at weekends.
 ** On weekdays hashpoints east and west of longitude 30°W are calculated separately, so may both be close to 30°W or 180°E/W.