Difference between revisions of "Time-traveller achievement"
From Geohashing
imported>Mckaysalisbury (I don't think the "lucky" works arbitrarily at other latitudes.) |
imported>Benjw (Undo revision 477251 by Mckaysalisbury (talk) It works at other latitudes; it's talking about points close to the prime meridian, not points close to the equator.) |
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* get lucky. | * 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. | ** 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 | + | ** Further from the equator this longitude can be calculated from 0.000036° / cos(Latitude). The poles are singularities! |
** A similar effect applies at longitude +/- 179.999964°, but only at weekends. | ** 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. | ** 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. | ||
Revision as of 14:43, 25 April 2016
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This user earned the Time-traveller achievement
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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.
- Further from the equator this longitude can be calculated from 0.000036° / cos(Latitude). The poles are singularities!
- 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.
Winners
- 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 ;)
See also
Multihash -- reach multiple geohashes on one day
