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BratPISY This mean curve (chronology) was published (as a list of digits) by Alf Bråthen 1995,[1] but he has borrowed it from a rather unspecified Russian source, published in Moscow[2] It is compiled from pines in the area south and west of Stockholm. The table in the book covers the timespan AD 1083-1992. Unfortunately the chronology have some severe problems. They are revealed when doing a block analysis towards a combination of references from Gotland, Dalarna and Småland[3] and local Stockholm area references for the youngest part.

The oldest part (before about 1283) is erroneously dated 9 years too late. There are also several segments which does not match towards other references and have to be removed. Among them the youngest 100 years.


BratPISY-rev.rwl "Washed" and corrected version. Segments with low correlation values towards other references removed, and the 9 year error in the oldest part is corrected.


  1. Bråthen 1995 pp. 122 ff.
  2. Bråthen 1995 p. 24
  3. SE005 (Gotland, Project Extraterrestrial) SE007 (Dalarna, Project Extraterrestrial) and 5church (Medieval Småland by Lars Löfstrand)


  • Alf Bråthen: Dated wood from Gotland and the diocese of Skara, Forlaget Hikuin, 1995, ISBN 87-87270-75-7
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