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#dendrochronology — Public Fediverse posts

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  1. Phantom Time Hypothesis Theory

    This is a theory proposed in 1991 by German historian & publisher Heribert Illig. The hypothesis claims a huge chunk of the Early Middle Ages never happened. According to Illig, we’re not living in the year 2026, but rather around 1729.

    It hypothesizes a conspiracy by the Holy Roman Emperor Otto III & Pope Sylvester II to fabricate the Anno Domini dating system retroactively, to place them at the special year 1000, & to rewrite history to legitimize Otto’s claim to the Holy Roman Empire.

    Illig believed that this was achieved through the alteration, misrepresentation & forgery of documentary & physical evidence. According to this scenario, the entire Carolingian period, including the figure of Charlemagne, is a hoax with a “phantom time” of 297 years (614-911 AD) added to the Early Middle Ages.

    Illig’s claims include:

    • Holy Roman Emperor Otto III desperately wanted to reign during the monumental year of 1,000 AD, believing it would solidify his divine right & align with Christian eschatological milestones.
    • Pope Sylvester II had the theological authority & administrative reach to help alter the calendar.
    • Byzantine Emperor Constantine VII & the Eastern Roman Empire allegedly assisted in fabricating backstories, genealogies, & documents to legitimize the new timeline & secure political alliances.
    • There’s a scarcity of archaeological evidence that can be reliably dated to 614-911 AD.
    • Radiometry (measuring electromagnetic radiation) & dendrochronology (tree ring dating) are inaccurate dating methods.
    • Medieval historians rely too much on (older) written sources.
    • The Romanesque architecture in the 10th century Western Europe suggests that the Roman era wasn’t as long as conventionally thought.
    • At the time of the intro of the Gregorian Calendar in 1582 AD, there should’ve been a discrepancy of 13 days between the Julian Calendar & the real (or tropical) calendar. When the astronomers & mathematicians needed to be adjusted by only 10 days.

    By inventing nearly 3 centuries of history, these rulers could fabricate a glorious, heroic past to legitimize Otto III’s own imperial ambitions. Creating the myth of Charlemagne as the ultimate Christian King. From this, Illig concludes that the AD era had counted roughly 3 centuries that never existed.

    Illig based his hypothesis on a few distinct anomalies in the archaeological & textual record:

    • The Gregorian Calendar Mathematical Glitch
      • Illig’s primary argument stems from the calendar reform of 1582. When Pope Gregory XIII introduced the Gregorian Calendar to replace the Julian Calendar, the calendar had drifted out of sync with the solar year. The Julian year was slightly too long, drifting by about 1 full day every 128 years. By 1582, the calendar should have drifted by approximately 13 days. However, Pope Gregory’s astronomers only shifted the calendar by 10 days. Illig argued that this 3-day discrepancy mathematically proves that roughly 300 years never actually passed to cause that extra drift.
    • The Scarcity of Archaeological Evidence
      • The Early Middle Ages have long been colloquially known as a period of archaeological scarcity, because the period simply didn’t happen. He claimed that the Romanesque architecture of the High Middle Ages seemed to pop up too suddenly. Suggesting it directly followed late Roman architecture without a 300-year gap.
    • Forged Documents
      • It’s a well-known fact among medieval historians that the Middle Ages were rife with forged documents, like the famous Donation of Constantine. Illig weaponized this fact, arguing that if so many medieval charters, land grants, & Chronicles were proven fakes. Then the entirety of the era’s documentation could be a coordinated forgery.

    Here’s the opposition’s evidence:

    • Astronomy Doesn’t Lie
      • Pliny the Elder recorded a solar eclipse in 59 AD.
      • Byzantine emperor/astronomer Heraclius recorded a solar eclipse in 610 AD, right before the “phantom” era.
      • Independent observations from Tang Dynasty China, Islamic astronomers, & Mayan astronomers record celestial events that perfectly match the traditional European timeline. If 300 years were missing, every single eclipse recorded before the 10th century would be misaligned by 3 centuries when calculated backward using modern orbital mechanics. They’re not.
    • Dendrochronology (Tree-Ring Dating)
      • Dendrochronology allows scientists to date wooden artifacts & structures with absolute precision by matching the patterns of annual tree growth rings. Organizations like the Hohenheim University in Germany have constructed a continuous, unbroken tree-ring chronology for Central Europe that stretches back over 10,000 years. There’s no “gap” or missing 300 years in the oak trees of Europe. The rings form a continuous timeline straight through the Early Middle Ages.
    • Global Interconnectedness
      • For Illig’s theory to work, the conspiracy would have to extend far beyond the Holy Roman Empire & the Papacy. You would have to believe that the Islamic Umayyad & Abbasid Caliphates, the Tang Dynasty in China, the Anglo-Saxon kingdoms in Britain, & the Maya civilization in Mesoamerica all colluded to invent 3 centuries of fake leaders, wars, literature, & internal history at the exact time, matching Otto’s fabrications perfectly.

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    #1000AD #10thCentury #1582 #1729 #1991 #2026 #325AD #45BC #59AD #610AD #614AD #911AD #AngloSaxon #AnnoDomini #Britain #ByzantineEmperorConstantineVII #ByzantineEmperorHeraclius #CarolingianPeriod #CentralEurope #Charlemagne #China #CouncilOfNicaea #DarkAges #Dendrochronology #divineRight #DonationOfConstantine #EarlyMiddleAges #Easter #EasternRomanEmpire #German #Germany #GregorianCalendar #HeribertIllig #HighMiddleAges #HohenheimUniversity #HolyRomanEmperorOttoIII #HolyRomanEmpire #Islam #JulianCalendar #JuliusCaesar #Mayan #Mesoamerican #MiddleAges #PhantomTimeHypothesisTheory #PlinyTheElder #PopeGregoryXIII #PopeSylvesterII #Radiometry #TangDynasty #WesternEurope
  2. #52wochenfotochallenge #lichtundschatten & #FotoVorschlag #Thermometer & #fossilfriday

    Ein #Sammlungsstück zu den heutigen Hashtags: Kein echtes #Fossil - subfossil, noch nicht #versteinert , aber dabei 😁

    Ein gut 6.000 Jahre altes Stück #Holz 🪵 aus der #Elbe in Tschechien, bei dem man die #Jahresringe als hellere und dunklere Linien erkennen kann. So kann man nicht nur die vorgeschichtlichen Temperaturen 🌡️ ablesen, sondern per #Dendrochronologie auch das Alter bestimmen 🧙‍♂️

    #dendrochronology

  3. Some of my samples from Dalkeith Old Oaks used to build a 450 year long oak chronology for South East #Scotland. Publication imminent. #FindsFriday #dendrochronology

  4. A massive multi-stem oak which #Dendrochronology revealed has an early 19th C stem origin date. It looks much older. This is in the wood pasture ‘Dairy Wood’ at Borders Forest Trust’s Corehead estate near Moffat. #ThickTrunkTuesday #treeclub #trees

  5. Tree rings and charred millet rewrite the Bronze Age history of Tabakoni in western Georgia. Precise dates reveal centuries of rebuilding, wetland farming, and persistence in the Colchian lowlands. #Archaeology #BronzeAge #Caucasus #Dendrochronology anthropology.net/p/timber-time

  6. St Mary’s Haddington 🏴󠁧󠁢󠁳󠁣󠁴󠁿 has some remarkable medieval oak timbers in the nave roof. My #dendrochronology work there dated them to the early 1400s and revealed them as Baltic baulks from the Gdansk region. #MedievalMonday

  7. Trouet delights us with her dedication to the tangible appeal of studying trees, a discipline that has taken her to austere and beautiful landscapes around the globe and has enabled scientists to solve long-pondered mysteries of Earth and its human inhabitants.

    #books
    #trees
    #dendrochronology

  8. Tree Story by Valerie Trouet, 2020

    The History of the World Written in Rings
    Children around the world know that to tell how old a tree is, you count its rings. Few people, however, know that research into tree rings has also made amazing contributions to our understanding of Earth's climate history and its influences on human civilization over the past 2,000 years.

    #books
    #nonfiction
    #trees
    #TreeRings
    #dendrochronology

  9. #KnowledgeByte: #Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed.

    Here is a brief overview.

    knowledgezone.co.in/posts/What

  10. @glennf @maxleibman
    Now, that’s not a term you’ll hear everyday.
    #dendrochronology

  11. I am looking forward to Monday the 26th of May! The day starts with a great symposium on #dendrochronology and #archaeology archonline.nl/may-2025/tree-ri
    In the afternoon I will publicly defend my thesis:
    vu.nl/nl/agenda/2025/promotie-
    And after that it's time for a drink!

  12. I have written a small R-script to download all tree-ring data from the ITRDB (measurements and chronologies). Anyone can create a local copy, just in case the data might not be available anymore from @noaa.gov

    github.com/RonaldVisser/Downlo

    #dendrochronology #treering #opendata #share

  13. Special archaeo-dendro issue of Dendrochronologia being produced … going to be interesting … follow @dendro-aoife.bsky.social for more info. She is in the hot seat bringing it about. Good idea Aoife, BlueSky is all about the tags #dendroarchaeologia #dendrochronology #archaeology #ForestFriday

    RE: https://bsky.app/profile/did:plc:jxcgfnd7gjcyhnvjnihchpmm/post/3llgc2ibgdk2l

  14. A collaborative contribution is ‘in preparation’ as they say. Thanks to Aoife @dendro-aoife.bsky.social and her Dendrochronologia colleagues for making this happen. #Dendrochronology #Archaeology

    RE: https://bsky.app/profile/did:plc:jxcgfnd7gjcyhnvjnihchpmm/post/3lkpy6jc3u22k

  15. @remixtures wow, Mauna Loa CO2 data is used for a lot of things, not only #ClimateChange science, #DendroChronology for example. This will affect a lot of scientists also out of the US.
    #USpol affects us all.

  16. Cool new paper using tree-rings to reconstruct historical and contemporary #fire prevalence in North American #forests.

    The eastern US is often thought of as the "wet" side of the country, but fires were frequent and large and intentional, historically. And even as reduced fire contributes to mesophication, #drought intensification means severe fires can still occur.

    nature.com/articles/s41467-025

    #wildfire #ecology #dendrochronology #biogeography #ClimateChange

  17. Transport of bulk materials such as #wood in the #Roman period was most likely done in these large barges, transporting timber over short and sometimes long distances (> 100 km). How do we now this? Answer:
    #Archaeology, #Dendrochronology and #DataScience, see e.g. tinyurl.com/496yfzz2

  18. I have updated the list of #rstats packages for #dendrochronology by adding the CTRing package that was recently published in Dendrochronologia:

    ronaldvisser.github.io/Dendro_

  19. #QuizOfTheDay: #Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed in a tree.

    Who is considered to be founder of the discipline of dendrochronology?

    A. Willard Libby
    B. A. E. Douglass
    C. Carl Linnaeus
    D. Gregor Mendel

    knowledgezone.co.in/resources/

  20. #KnowledgeByte: #Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed.

    Here is a brief overview.

    knowledgezone.co.in/posts/What

  21. On my Sunday hike in the Bingerwald, I came across a cool interpretive trail featuring explanatory signs about soils and dendrochronology. Complete with a soil pit! Cool as.

    #SciComm #EnvironmentalScience #dendrochronology #SoilScience

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