Re: Lot's of eggs, but where is the chicken? Foundation of a Data ID Unit

Hi Sebastian,

If you want to bring metadata "up to date" ...

150 years ago, or so Gauss offered up an algorithm for calculating the date of Easter. The procedure is accurate to within 3 days. It can also be modified to compute the older Passover and lots of variants [1].  If you are neither Christian nor Jew, no problem, you probably know one.

Gauss (and his contemporary Thomson/Kelvin) may have been pious, but they were engineers and therefore sneaky bast'rds.  The precision is important as it enables you to link lunar month (tides) and the Spring Equinox without introducing those parameters into the harmonic calculation.  Gauss was interpolating the Spring Equinox as half the distance (backwards) from Next Summer to Last Winter. 

http://www.rustprivacy.org/2014/balance/Easter.ods
http://www.rustprivacy.org/2014/balance/Easter.xls

(use the ODS version if possible, there is no EASTERSUNDAY() function in EXCEL)

I am also a sneaky bas..., um, kindred spirit, and observe that if you compute the haversine(DOY)=(1-cos(DOY))/2=sin(DOY/2)^2 on the quarter, that is (1460+1 (Leap) Day/16) then you get a Season phase (hour) angle ... Spring(.5),Summer(1),Fall(.5),Winter(0)  and furthermore, this works for any square codeset or set of acronyms.  The groups [Spring,Summer,Fall]=[Agricultural Year] and [Fall,Winter,Spring]=[Academic Year] are always present. There is no use concerning yourself with timestamps and fractional phase angles and the binomial distribution because, as Gauss knew, if you are correct within 3 days, Easter is the one that's a Sunday.

Happy Easter :-)
 
--Gannon

[1] http://www.staff.science.uu.nl/~gent0113/easter/eastercalculator.htm

--------------------------------------------
On Thu, 4/17/14, Sebastian Hellmann <hellmann@informatik.uni-leipzig.de> wrote:

 Subject: Lot's of eggs, but where is the chicken? Foundation of a Data ID  Unit
 To: "public-lod" <public-lod@w3.org>, public-gld-comments@w3.org, "datahub-discuss@lists.okfn.org" <datahub-discuss@lists.okfn.org>
 Date: Thursday, April 17, 2014, 8:29 AM
 
 
   
 
     
   
   
     Dear all,
 
     I would like to wish you a Happy Easter. At the same
 time, I have an
     issue, which concerns LOD and data on the web in
 general.
 
     
 
     As a community, we have all contributed to this image:
     http://lod-cloud.net/versions/2011-09-19/lod-cloud.html 
 (which is
     now three years old)
 
     You can see a lot of eggs on it, but the meta data (the
 chicken) is:
 
     - inaccurate
 
     - out-dated
 
     - infeasible to maintain manually 
 
     (this is my opinion. I find it hard to belief that we
 will start
     updating triple and link counts manually)
 
     
 
     Here one pertinent example:
 
     http://datahub.io/dataset/dbpedia
 
     -> (this is still linking to DBpedia 3.5.1)
 
     
 
     
 
     Following the foundation of the DBpedia Association we
 would like to
     start to solve this problem with the help of a new group
 called
     DataIDUnit (http://wiki.dbpedia.org/coop/DataIDUnit)
 using "rough
     consensus and working code" as their codex:
     http://wiki.dbpedia.org/coop/
 
     
 
     The first goal will be to find some good existing
 vocabularies and
     then provide a working version for DBpedia.
 
     A student from Leipzig (Markus Freudenberg) will
 implement a "push
     DataId to Datahub via its API" feature.
 
     This will help us describe the chicken better, that laid
 all these
     eggs. 
 
     
 
     Happy Easter, all feedback is welcome, we hope not to
 duplicate
     efforts.
 
     Sebastian
 
     
 
     
 
     -- 
 
       Sebastian Hellmann
 
         AKSW/NLP2RDF research group
 
         DBpedia Association
 
         Insitute for Applied Informatics (InfAI) 
 
         Events: 
 
         * 21st March, 2014: LD4LT
           Kick-Off @European Data Forum
 
         * Sept. 1-5, 2014 Conference Week in Leipzig,
 including
         
 
         ** Sept 2nd, MLODE 2014 
 
         ** Sept 3rd, 2nd DBpedia Community Meeting
 
         ** Sept 4th-5th, SEMANTiCS
           (formerly i-SEMANTICS) 
 
         Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
 
         Projects: http://dbpedia.org,
         http://nlp2rdf.org, http://linguistics.okfn.org,
         https://www.w3.org/community/ld4lt
 
         Homepage: http://aksw.org/SebastianHellmann
 
         Research Group: http://aksw.org
 
         Thesis:
 
         http://tinyurl.com/sh-thesis-summary
 
         http://tinyurl.com/sh-thesis

Received on Thursday, 17 April 2014 17:54:38 UTC