For quite some time we have been arguing that wood archaeologically anchored in West-Roman time has never been properly crossdated with dendrochronology towards wood of later times. The absence of proper crossdating is apparent as it was necessary to "calibrate" the Roman dendro complex with wood from the Roman camp at Oberaden. (The time that this camp was used can be constrained to a limited range historically.) We argue that the conventional date of the Roman dendro complex is too old by more than 200 years.

Nevertheless modern natural scientists have not always refrained from connecting e.g. their ice core data to historical events of the Roman period, a practice which possibly has led to incorrect results.

But there is hope. Now a group of scientists report on ice core chronologies which do not rely on calibration with historical events like the Vesuvius eruption of RomAD 79 (which occurred in 311 if we are right).

Read more as an update to "Dendro audit".

After our dendrochronological re-investigation of European major oak- and pine-chronologies, we suspect that the part anchored archaeologically in Roman time is dated 218 years too old conventionally (see under tab "Dendro audit").

To validate this puzzling result, we have been looking at historical astronomical observations and tried to verify them towards the NASA catalog of eclipses. We have described this effort under tab "Ancient history", where we conclude that if we are right, then the error in our time count is exactly 232 years (though the dendrochronological error is "only" 218 years).

Very recently we had a discussion about the Julian star, which is historically described in multiple sources as a comet that occurred after the assassination of Julius Caesar in RomBC 44. As a commemoration of this event, the star can be seen on several Roman contemporary coins. However, it has been hard to find a celestial body which exactly matches the observations, therefore certain scientists regard Caesar's star as fiction.

This is not miraculous, because if we are right about this 232 years calendar error, then everybody has been looking at the wrong place on the astronomical time line. Looking instead 232 years later than assumed conventionally points at a comet exactly matching the sources, which indicates that we actually might be right.
Read the story here: Caesar's comet

Now we launch our new pages about various aspects of dendrochronology.
Try the tabs under "Tools and basics" if you are new to the topic.

We would like to push for some interesting news about our chronology project which has progressed to the next phase. Read more under the tabs "Dendro audit" and "Ancient history".
Also our "Local history" about dendro-dating in the Stockholm archipelago has been updated.
A search-function which covers the whole new site is available on each page.

Click here to see the latest blog post.

Our CDendro & CooRecorder tutorial site is found as before at