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#dendrochronology — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #dendrochronology, aggregated by home.social.

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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. Burnt Wooden Beams from Jerusalem’s First Temple Destruction Unearthed in the City of David

    Archaeologists have uncovered a remarkable set of charred wooden beams dating to the Babylonian destruction of Jerusalem in 586 BCE during excavations at the Givati Parking Lot in the City of David, within the Jerusalem Walls National Park. The discovery, made by the Israel Antiquities Authority and Tel Aviv University, provides rare physical evidence of one of the most significant events in the history of the ancient city: the destruction of the First Temple.

    8. Israel Antiquities Authority excavations in the City of David. Photo Reut Vilf, City of David.

    The massive timbers were found inside a First Temple period building that collapsed during the devastating fire that accompanied the Babylonian conquest. According to archaeologists, their extraordinary preservation was made possible by an unusual combination of circumstances. As the building burned, wall plaster melted and flowed over the collapsed beams, sealing the charred wood beneath it and protecting it from decay for approximately 2,600 years.

    A roof structure frozen in time

    Excavation director Efrat Bocher believes the beams originally supported the roof of an inner courtyard within the building. When the structure was destroyed by fire, the roof collapsed onto the floor, where the timbers remained buried beneath layers of debris.

    https://youtu.be/1P2lfAdk8hU

    Wood rarely survives for millennia in the climate of the southern Levant, making the discovery particularly significant. The find offers archaeologists an exceptionally well-preserved glimpse into the architecture and construction techniques of Jerusalem during the late Iron Age.

    A breakthrough for dendrochronological research

    One of the most important aspects of the discovery is the unusually high number of tree rings preserved in the beams. According to Dr. Johanna Regev of the Israel Antiquities Authority, the timbers provide an unprecedented opportunity for dendrochronological analysis.

    4. The growth rings of the wooden beams discovered in the City of David. Photo Efrat Bocher.

    Until now, wooden remains from the region have generally allowed dating within broad chronological ranges spanning centuries. These newly discovered beams, however, contain enough growth rings to potentially narrow dating to within a decade, offering a level of precision rarely achieved for archaeological contexts from the First Temple period.

    A landscape shaped by memory

    The excavation team also suggests that Jerusalem’s inhabitants, after returning to rebuild the city, may have intentionally left portions of the destruction untouched. According to Dr. Yiftah Shalev, who co-directs the excavation with Prof. Yuval Gadot, preserving the ruined remains may have served as a deliberate act of collective remembrance.

    5. Destruction remains discovered during the Israel Antiquities Authority excavations in the City of David. Photo Reut Vilf, City of David.

    This concept, often described as a “landscape of memory,” is known from other ancient societies, where visible traces of catastrophe were intentionally retained to commemorate dramatic historical events. In Jerusalem, the archaeological evidence appears to reflect a conscious decision to build a new city while preserving material evidence of its destruction beneath later occupation layers.

    Announced shortly before Tisha B’Av, the annual Jewish fast commemorating the destruction of both the First and Second Temples, the discovery carries particular historical and symbolic significance. For the excavation team, these charred beams represent a direct and deeply moving witness to the moment when ancient Jerusalem was consumed by fire.

    Opening image: 3. The burnt wooden beams discovered in the City of David. Photo Reut Vilf, City of David

    Source: IAA – Israel Antiquities Authority

    #ancientJerusalem #archaeology #BabylonianConquest #biblicalArchaeology #CityOfDavid #dendrochronology #FirstTemple #IronAge #IsraelAntiquitiesAuthority #Jerusalem #TelAvivUniversity #TishaBAv
  3. #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

  4. 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

  5. Tree-ring dating upends record for Estonia’s oldest door | News

    Researchers say a 14th-century wooden door tucked inside a medieval chapel in Tallinn is Estonia’s oldest, predating the…
    #Estonia #EE #Europe #Europa #EU #Churches #dendrochronology #Eesti #estonia #estonia'soldest #history #Uudised
    europesays.com/2707366/

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. Ardura Community Forest, Mull 🏴󠁧󠁢󠁳󠁣󠁴󠁿 The Mull & Iona Community Trust engaged us to find out the age of oaks which had been felled in the 1960s when the Sitka spruce plantation was created by the Forestry Commission. They were mostly around 200 years old. #dendrochronology #ThickTrunkTuesday #Mull

  12. #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

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

  14. 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!

  15. 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

  16. 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

  17. 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

  18. @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.

  19. 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

  20. 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

  21. 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_

  22. #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/

  23. #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

  24. 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

  25. My little window into the history of a wood pasture in southern Scotland.

    Working on ageing tree cores from Dairy Wood near Moffat for @bordersforesttrust to help unravel the history of the wood and inform its future conservation management.

    This is part of an ash core under the microscope, revealing its lovely clear ring-porous tree-ring structure.

    #dendrochronology #rewilding #landscapearchaeology #woodlandhistory #scotland

  26. My office today - not too shabby. Assessing timbers for tree-ring dating in Kings Old Buildings, Stirling Castle for Historic Environment Scotland via AOC Archaeology.
    #dendrochronology #buildingsarchaeology #Scotland

  27. Nice @edzob , although I need to login to see your list and I am not using overleaf...
    I am maintaining a list of #dendrochronology related R packages:
    ronaldvisser.github.io/Dendro_
    There are so many lists, we might need another list to list these lists ;)

    @OpenSciTwente @oscu @oscmaastricht @oscgroningen

  28. [blog] From scripts to package. Developing dendroNetwork and learning with rOpenSci 🌲

    @RonaldVisser goes from a set of scripts for comparing tree rings to a fully reviewed R pkg! 🎉 With resources & advice for starting your first R package 📖
    Such a small thing led to tracing wood used to build Roman ships found on the bed of the Roman river Rhine! ⚓

    ropensci.org/blog/2024/06/06/f

    🙏 Big thanks to reviewers @kaija_bean and Zach Gajewski!

    #RStats #archaeology #dendrochronology #networkscience
    @rstats

  29. Scientists showed #2023 was warmest #NorthernHemisphere #summer since 1850, when people started systematically measuring temp. Now, researchers say it was hottest in 2,000 years.
    Scientists used #Dendrochronology, study of tree rings to compare last year’s #extremeheat with temperatures over past two millenniums. #GreenhouseGas in the atmosphere from the burning of #fossilfuels are responsible for most of the increase
    nytimes.com/2024/05/14/climate
    archive.ph/p3dr4
    #climatechange #climatecrisis

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