Karahan Tepe Astronomical Alignments

About Karahan Tepe Astronomical Alignments

On December 20, 2021, Hugh Newman and JJ Ainsworth watched winter-solstice sunrise light travel through a 70-centimeter porthole in the wall of a subterranean chamber at Karahan Tepe in southeastern Turkey, pass between two rock-cut pillars, and illuminate a carved stone head on the opposite wall for roughly 45 minutes. If their reading is correct, the chamber — Structure AB, or the Pillars Shrine — is the earliest known solstice-aligned building, predating Newgrange in Ireland by about six thousand years. Karahan Tepe is one of roughly a dozen Pre-Pottery Neolithic sites in Sanliurfa Province known collectively as the Tas Tepeler — the "Stone Hills" — spread across a region of about 200 square kilometers. Excavations under Necmi Karul of Istanbul University began in 2019 and the site remains under active investigation, with only an estimated 5-10% of it exposed. Its astronomical-alignment literature is consequently young, thinner than the century of published measurement at Stonehenge or the Giza plateau, and dominated by a small number of observational visits rather than a sustained survey. What follows presents the tightest version of the current claims. The reader should hold them as hypotheses formed on a short window of evidence, more provisional than the archaeoastronomy of better-studied sites.

The porthole stone and the winter solstice beam. Structure AB, often called the Pillars Shrine, is the subterranean chamber at the centre of the astronomical discussion. It contains eleven standing pillars carved in situ from the bedrock, a large carved head protruding from the western wall, and — in the wall between AB and the adjoining Structure AD — a porthole stone: a slab with a deliberately shaped aperture of roughly 70 centimeters diameter. Necmi Karul's 2021 field report describes the porthole as a passage through which visitors likely crawled between chambers, using carved steps in AD to reach the aperture. Hugh Newman and JJ Ainsworth, British independent researchers visiting the site during its open period, conducted the first systematic astronomical observation at Karahan Tepe on December 20, 2021 — one day before the exact winter solstice (21 December 2021, 15:58 UTC). The sunrise azimuth is effectively stationary for roughly a week either side of the solstice, so the December 20 observation captures the solstice-window alignment rather than missing it. Their observation, published on Graham Hancock's site with photographs and video documentation, showed a beam of sunrise light entering through the porthole aperture at an oblique angle, passing between two of the central pillars in Structure AD, and illuminating the carved stone head on AB's western wall for approximately 45 minutes. During the beam's transit the light narrowed as the sun rose, shifting across the head's features.

Earth's axial obliquity — the tilt of the rotational axis relative to the orbital plane — varies between approximately 22.1° and 24.5° on a 41,000-year cycle, following the Milanković parameter that drives ice-age cadence. At the present epoch, obliquity is 23.44° and decreasing slowly. At 9400 BCE, obliquity was about 24.14°, roughly 0.7° greater than today. A steeper tilt produces a slightly higher winter-solstice sun at a given northern latitude; the sun therefore rose at a marginally higher altitude above the horizon at Karahan Tepe's latitude (~37.09° N, 39.30° E in Haliliye district, with the parent entity record carrying slightly different coordinates) in the Neolithic than it does now. Newman and Ainsworth's calculation is that the porthole-beam alignment would have functioned more precisely at construction epoch than at observation epoch — the beam would have struck the head more directly. This is consistent with a deliberately engineered sighting geometry rather than a coincidence of modern viewing, though the geometric margin is small enough that independent reconstruction is warranted.

Measurement history and named observers. The astronomical literature on Karahan Tepe is essentially a five-year accretion. Necmi Karul's excavation reports (published in Turkish and in English summaries from 2021 forward) establish the architectural framework. The winter-solstice alignment observation is Newman and Ainsworth, 2021. Martin Sweatman of the University of Edinburgh's School of Engineering, whose Prehistory Decoded (2019) argued that Pillar 43 at Göbekli Tepe encodes a comet impact and a zodiacal calendar, extended his analysis to Karahan Tepe in a 2024 paper in Time and Mind. Howard Crowhurst, based in Carnac, France, and author of Carnac: The Alignments (2011), has extended his 3-4-5 Pythagorean triangle methodology (originally developed at Carnac and in Egypt) to the Tas Tepeler landscape, proposing geometric relationships between sites including Karahan Tepe and Göbekli Tepe. Crowhurst's measurements are available in lecture and video form and have not been submitted for peer review. Andrew Collins has published popular treatments placing Karahan Tepe within a broader lost-civilization and cosmological framework developed in his earlier Göbekli Tepe work; his focus is on symbolic cosmology (Milky Way, serpent iconography) more than direct alignment measurement. Academic archaeoastronomers — Clive Ruggles, Juan Antonio Belmonte, Giulio Magli — have not yet published dedicated studies of Karahan Tepe, though Magli's Archaeoastronomy: Introduction to the Science of Stars and Stones (2015) discusses Göbekli Tepe in the context of early monumental astronomy (the Tas Tepeler designation was formalized only in 2021, after Magli's textbook).

The solstice itself, and what it means at this latitude. A solstice is the moment when the sun reaches its maximum or minimum declination — 23.44° north at June summer solstice, 23.44° south at December winter solstice in the present epoch. At Karahan Tepe's latitude of roughly 37.09° N, the winter solstice sun rises at azimuth approximately 119° (measured clockwise from north) and reaches a maximum altitude above the horizon of about 29.5° at solar noon. At 9400 BCE, with obliquity approximately 24.14°, winter-solstice declination reached -24.14° and the rise azimuth shifted slightly — by under a degree — toward the south. The distinguishing property of the solstice sunrise from a builder's perspective is that the azimuth stops moving for several days. Through most of the year the sunrise azimuth migrates along the horizon from day to day; at the solstices, for roughly a week on either side, the azimuth is effectively stationary. This is what makes solstice alignments achievable by pre-literate observers. The event has a visible horizon marker: the sun rises at the same spot for many days running, and that spot can be marked, walked to, and eventually built to.

The Sweatman calendar hypothesis. Martin Sweatman's application of astronomical-notation analysis to the Tas Tepeler is laid out in his 2024 paper "Representations of calendars and time at Göbekli Tepe and Karahan Tepe support an astronomical interpretation of their symbolism" (Time and Mind, DOI 10.1080/1751696X.2024.2373876). The core decoding is on Göbekli Tepe's Pillar 43, where Sweatman interprets V-shaped incisions as day counts and reads the arrangement as a 365-day solar year composed of 12 lunar months plus 11 epagomenal days. Sweatman then extends the same lunisolar framework to Karahan Tepe, arguing that the eleven rock-cut pillars of Structure AB — the Pillars Shrine — function as a structural representation of the same 11-month lunar count, with the number "11" repeating across both sites as a compositional theme tied to the 11 epagomenal days that complete the solar year. The Karahan Tepe evidence in Sweatman's reading is architectural (the pillar count itself) rather than glyphic, and is methodologically continuous with the Pillar 43 analysis at Göbekli Tepe. If Sweatman's reading is correct, this is the earliest known lunisolar calendar encoding, predating the Sumerian calendar by roughly 6,500 years. If Sweatman's reading is incorrect — if the pillar count is symbolic, commemorative, or serves a different structural purpose — the calendar claim falls. The interpretive rules for pre-literate Neolithic symbol systems are not well established. A skeptical reader should treat Sweatman's calendar as one possible decoding among several, not as a confirmed archaeological fact.

Venus as a secondary target. Newman has proposed, on the basis of observations and stellar-simulation modeling, that Venus may have illuminated the same porthole-and-head alignment at specific points in its 584-day synodic cycle. Venus traces a five-pointed path in the ecliptic over eight solar years — five inferior conjunctions (Venus passing between Earth and sun) producing a pentagonal pattern known to later Mesopotamian, Mayan, and Vedic astronomy. At certain points in the cycle, Venus's heliacal rising as morning star produces an azimuth close enough to the winter-solstice sun to engage the same aperture geometry. The Venus claim is suggestive rather than demonstrated; the observational window has not been formally tested. Bryn Celli Ddu in Anglesey is an inverse parallel — summer-solstice sunrise down its passage, plus Venus as evening star through a rear "light box" in certain years of the 8-year cycle — demonstrating that dual sun-and-Venus architecture has independent Neolithic precedent, even though the specific body and direction differ from Karahan Tepe. Karahan Tepe's Venus hypothesis awaits comparable independent verification.

The inter-site geometry of the Tas Tepeler. Howard Crowhurst's claim that Karahan Tepe and Göbekli Tepe sit within a landscape organised by 3-4-5 Pythagorean geometry belongs to a tradition of megalithic-metrology research initiated by Alexander Thom in the 1950s-70s. Thom's statistical analysis of British stone circles, published as Megalithic Sites in Britain (1967) and Megalithic Lunar Observatories (1971), proposed a standardized unit he called the megalithic yard (2.72 feet / 0.829 meters). Thom's work was sharply critiqued by Clive Ruggles in Megalithic Astronomy: A New Archaeological and Statistical Study of 300 Western Scottish Sites (BAR British Series 123, 1984) and later in Astronomy in Prehistoric Britain and Ireland (Yale University Press, 1999), and by Douglas Heggie in Megalithic Science: Ancient Mathematics and Astronomy in North-West Europe (Thames & Hudson, 1981). These researchers argued that the statistical evidence for a single unit was weaker than Thom claimed. Crowhurst's application of similar methods to the Tas Tepeler is suggestive but sits in the same contested methodological space. A 3-4-5 triangle between points in a landscape of roughly 200 square kilometers is unlikely to be strictly coincidental but not difficult to find among any sufficiently dense cluster of sites. Independent geodetic survey would be needed before the claim could be accepted as evidence of deliberate inter-site planning.

Critiques and the fragility of early claims. Karahan Tepe's astronomical case needs to be measured against the standard critiques of early-archaeoastronomy claims. Alexander Thom's alignments at British stone circles were reinterpreted after the original enthusiasm as mostly chance, once Clive Ruggles applied rigorous statistical tests to large samples in his 1984 BAR volume and synthesised the argument in Astronomy in Prehistoric Britain and Ireland (1999). Gerald Hawkins's Stonehenge Decoded (1965) proposed an enormous number of astronomical alignments; Richard Atkinson's "Moonshine on Stonehenge" (Antiquity 40, 1966) dismantled the statistical basis for most of them, and Jacquetta Hawkes published a separate skeptical review. The subset that survived those critiques was much smaller than Hawkins claimed. The general principle: in any sufficiently elaborate site, some number of astronomically meaningful azimuths will appear by chance. The test for deliberate alignment is whether those azimuths are the only ones present, or whether they are singled out over the non-astronomical ones. At Karahan Tepe the winter-solstice beam is striking, but the full set of structural azimuths has not yet been measured and published. A rigorous evaluation of the solstice alignment against chance expectation therefore awaits a fuller survey. Necmi Karul's own excavation reports do not endorse the astronomical interpretations — a point worth surfacing for readers weighing the evidence: the astronomical case is being built by independent researchers outside the excavation team, not by the team itself.

Ritual life and the observer inside the chamber. If the winter-solstice alignment at Structure AB is accepted as intentional, the ritual implication is specific. The chamber is subterranean, accessible through narrow passages. The observer or observers — nothing in the archaeological record specifies group size or role — would have entered through the porthole aperture between AD and AB, descended into the chamber's darkness, and waited for the solstice dawn. The beam enters for a bounded window (Newman and Ainsworth observed roughly 45 minutes) and lights the carved head. This is the pattern of solstice architecture found later at Newgrange in Ireland (c. 3200 BCE, 17-minute illumination), Maeshowe in Orkney (c. 2800 BCE), and Bryn Celli Ddu in Anglesey: dark interior, narrow aperture, timed illumination of a focal feature. At Karahan Tepe the tradition would date from roughly 9400 BCE — six thousand years earlier than Newgrange. The question is whether this indicates independent invention (solstice architecture as a convergent discovery made wherever builders watch the horizon long enough) or a continuous cultural lineage descending from the Tas Tepeler tradition to the much later western-European passage tombs. No artefactual evidence supports the transmission thesis directly; the independent-invention reading is currently the default.

Comparison to related sites. Within the Tas Tepeler network, Göbekli Tepe is the comparandum that matters most. Göbekli's Pillar 43 carries the "Vulture Stone" reliefs that Sweatman and others have interpreted as astronomical. Göbekli's Enclosure D has proposed alignments to Sirius rising. The two sites share stylistic, chronological, and regional context; they were likely occupied by related populations. If the astronomical thesis at Karahan Tepe is correct, Göbekli's claims gain plausibility. If it is wrong, Göbekli's claims should be rechecked. Outside the Tas Tepeler, the nearest chronological parallel is Jericho (Pre-Pottery Neolithic A, c. 9500 BCE) — but Jericho shows no surviving evidence of monumental astronomical architecture. Karahan Tepe and Göbekli Tepe therefore sit alone at the start of the recorded history of astronomical building.

What remains unknown. The Tas Tepeler sites have been under excavation for a brief moment of their potential investigation. Approximately 5-10% of Karahan Tepe has been excavated; the rest remains sealed. The published astronomical observations consist of one winter-solstice visit and subsequent stellar-simulation modeling. Independent verification of the porthole-beam alignment, rigorous survey of all structural azimuths, peer-reviewed testing of Sweatman's calendrical notation, and geodetic measurement of inter-site geometry across the Tas Tepeler have not yet been performed at the standard applied to Stonehenge or the Giza complex. The most responsible reading of the current evidence is that Karahan Tepe probably contains deliberate solstice architecture, that the case is strong enough to take seriously, and that definitive claims should wait for the next decade of fieldwork.

The carved head as focal element. The stone head in Structure AB is a substantial three-dimensional sculpture, roughly life-sized, emerging from the western wall of the chamber. Its features have been preserved in unusually good condition because the chamber was deliberately infilled in antiquity — buried, not abandoned — protecting the interior from weathering and reuse. The head is the terminus of the porthole beam: the point at which the solstice light arrives. In the architecture of solstice illumination, a focal element is always required. At Newgrange the focal element is a carved triple spiral on the interior chamber wall. At Maeshowe it is the back wall itself. At Bryn Celli Ddu it is a standing stone within the inner chamber. The function of the focal element is to make the arrival of light visible and meaningful — the beam has to land on something. Karahan Tepe's carved head is therefore architecturally integral to the alignment; if the head and the porthole were made at different times or for different purposes, the solstice-beam reading would weaken. The existing evidence from the excavation treats them as a single planned unit.

The subterranean context and atmospheric conditions. The chamber is below grade — a rock-cut subterranean room rather than a free-standing structure — set into a rocky hillside at roughly 720 meters elevation, with clear sight lines to the eastern horizon. The distinction matters astronomically. A free-standing stone circle like Stonehenge exposes its interior to ambient sky light, and the precision of any alignment is limited by the degree to which one patch of sky can be distinguished from another. A chamber accessed through a single small aperture achieves far higher precision: the interior is dark, and only light passing through the aperture reaches the focal element. Subterranean architecture, at the cost of restricting the observer's view of the full sky, gains the ability to record a single slice of azimuth and altitude with effectively no ambient interference. This is why Newgrange, Maeshowe, and the Tas Tepeler chambers all use the same basic geometry — it is the observationally optimal design for an alignment that only matters at one moment of the year.

Continuity of observation before permanent architecture. Any Pre-Pottery Neolithic astronomical alignment raises a prior question: how long must observation be sustained before it can be built into stone? The solstice-position discovery requires at least one full year of horizon watching — the observer has to see the sunrise azimuth walk north through spring, reach a maximum in summer, walk south through autumn, reach a minimum in winter, and begin walking north again. A single year is enough to notice the pattern. Precise construction of an alignment, though, requires multi-year observation: the horizon sunrise position at the solstice is identical for about a week before and after the event, so pinpointing the exact extremum requires refined observation across several cycles. Karahan Tepe was built after an unknown span of antecedent observation. The simplest hypothesis is that mobile or semi-mobile hunter-gatherer groups had watched the sky systematically for centuries before any of them chose to encode the observations in rock. The Tas Tepeler sites are the first chapter of a story whose earlier chapters are not preserved.

Significance

Karahan Tepe matters because it places the origin of deliberate astronomical architecture six thousand years earlier than the Neolithic-European passage tombs that once defined the category. If the winter-solstice alignment at Structure AB is accepted, then pre-literate, pre-agricultural hunter-gatherer populations were building subterranean observatories to mark the turning of the solar year. This rearranges the conventional chronology of ideas. The received narrative placed astronomy as a development of urban, literate civilizations — Babylonian star catalogues, Egyptian decan lists, the beginnings of mathematical astronomy in the second and first millennia BCE. Karahan Tepe and Göbekli Tepe push the empirical start of careful sky-watching back into the tenth millennium BCE, before agriculture, before pottery, before the earliest known settled villages. Only an estimated 5-10% of Karahan Tepe has been excavated; the architecture described here represents a small opening onto a much larger and still-sealed site. The astronomical observation described by the porthole-and-beam geometry is not mathematical astronomy — it requires no numbers, only the discovery that the sun's rising position has an extremum — but it is systematic observation, sustained across generations, encoded in permanent architecture.

The methodological significance runs parallel. Archaeoastronomy has generally worked with the monuments of literate civilizations: Egyptian temples, Mesoamerican pyramids, British stone circles for which a rich archaeological context exists. Karahan Tepe offers a test case for the method applied to a site where nearly no documentary or cultural context is available. Its builders left no texts, no artistic narratives beyond the carved figures, no calendrical inscriptions. If a solstice alignment can be demonstrated here to the standards the field applies to comparable monuments — Stonehenge, Newgrange, the Egyptian temples analysed by Juan Antonio Belmonte — it will have been demonstrated under unusually demanding evidentiary conditions: no written confirmation, no cultural inheritance, only the geometry of the stones against the sky. This is a useful sharpening of the discipline. It forces archaeoastronomers to state explicitly what an alignment claim means when nothing else about the culture is known.

The site also matters for its implications about the economic and cognitive capacities of pre-agricultural populations. Karahan Tepe's construction — carved pillars in situ from bedrock, rock-cut chambers, precise architectural planning — requires sustained labor, social coordination, and expertise transmitted across generations. The working assumption of 20th-century anthropology was that such capacities emerged with agriculture and surplus. Klaus Schmidt's excavation of Göbekli Tepe in the 1990s-2000s began to erode that assumption; Karahan Tepe deepens the erosion. Populations that had not yet domesticated crops or animals were building monuments that required more organization than early farming villages showed. This is an important correction to the standard sequencing of the Neolithic Revolution, and it has implications far beyond astronomy.

A separate layer of significance concerns the emotional geometry of the chamber itself. The subterranean architecture of Structure AB — enter through a small porthole, descend into darkness, sit while the beam arrives, watch it cross the carved face — is a ritual script that keeps reappearing in human religious architecture across continents and millennia. Newgrange, Maeshowe, Bryn Celli Ddu, the Mithraic chambers of the Roman Empire, the crypts of medieval European churches all share elements of this script. Karahan Tepe is the earliest surviving instance. Whatever specific beliefs its builders held, the physiological response — the body in the dark, the eye tracking a narrow band of arriving light — is reproducible and measurable. Newman and Ainsworth's team, the only researchers to publish an eyewitness account of the solstice beam, describe responses comparable to those documented at Newgrange and other later passage-tomb rituals. The architectural form survives because it produces a reliable state in the observer, and that reliability is what Karahan Tepe's builders found.

Finally, Karahan Tepe matters because the investigation is not finished. Unlike Giza or Stonehenge, where the archaeoastronomical literature is mature, Karahan Tepe is a site where new findings are expected. The next decade of excavation may confirm the alignment claims, refute them, or reveal additional alignments currently unsuspected. A reader of this page in 2030 should find it updated. That openness — a site still coming into focus — is unusual for monuments of this age and adds to the scientific interest of the case.

Connections

Karahan Tepe sits at the geographical and chronological centre of the Tas Tepeler cluster — Pre-Pottery Neolithic sites of southeastern Turkey including Göbekli Tepe, Nevali Çori, Sefer Tepe, and Harbetsuvan Tepesi. Göbekli Tepe is the most extensively excavated of the group, with Klaus Schmidt's 1994-2014 campaigns establishing the basic chronology and the iconographic vocabulary. Karahan Tepe's Structure AB operates on the same architectural logic as Göbekli's enclosures but preserves more of the interior arrangement, because its chamber was deliberately infilled in antiquity and thus escaped the weathering and reuse that degraded Göbekli's ring structures. The astronomical questions asked at the two sites are the same: what did the builders track, how precisely, and with what ritual purpose?

Beyond the Tas Tepeler, the most meaningful comparative network is the worldwide tradition of solstice-aligned passage architecture. Newgrange in Ireland (c. 3200 BCE) admits the winter-solstice sunrise through a specifically designed roof box to illuminate the inner chamber for 17 minutes. Maeshowe in Orkney (c. 2800 BCE) receives the winter-solstice sunset down a roughly 11-14.5 meter passage. Bryn Celli Ddu in Anglesey (c. 3000 BCE) has a proposed summer-solstice and Venus alignment — the summer-solstice sunrise shines down the passage to the back wall, and a rear light box admits Venus as evening star at sunset in certain years of the 8-year synodic cycle. The Tas Tepeler sites extend the passage-illumination pattern back by six thousand years. Independent invention rather than cultural inheritance is the default explanation; the gap between Karahan Tepe (c. 9400 BCE) and Newgrange is too long and the intermediate archaeological record too thin to support a continuous transmission thesis.

The Sweatman calendrical-notation hypothesis connects Karahan Tepe to a different network — the study of pre-literate symbol systems in Paleolithic and Neolithic art. Genevieve von Petzinger's work on Upper Paleolithic geometric signs (published as The First Signs, 2016) catalogued a recurring set of 32 non-figurative symbols across European cave art from roughly 40,000-10,000 BCE. Sweatman's calendrical reading of Karahan Tepe and Göbekli Tepe relies on the interpretability of marked-count notations in Neolithic contexts, a field that remains methodologically contested. The Ishango bone (c. 20,000 BCE) and the Lebombo bone (c. 42,000 BCE), both African, are the earliest candidate mathematical artefacts; their astronomical interpretations vary widely among researchers.

Within Satyori's library, Karahan Tepe belongs with the broader set of sites that rewrite the chronology of human cognitive achievement — sites that force a reconsideration of when certain capacities are supposed to have emerged. The Great Sphinx of Giza, at the other end of the solstice-equinox spectrum, is conventionally the oldest monumental sculpture at c. 2500 BCE; the Tas Tepeler figures predate it by seven thousand years. Stonehenge, the most studied solstice-aligned stone circle, postdates Karahan Tepe by six thousand years. The cosmological network that Karahan Tepe opens — the possibility that systematic astronomical architecture is as old as settlement-making itself, not a late product of civilizational maturity — changes how readers should understand every later site in this library.

The carvings inside Structure AB include a large three-dimensional face or head emerging from the western wall, and adjacent pillars with serpentine and figurative reliefs. These parallel the central T-pillars at Göbekli Tepe, whose carved figures (foxes, vultures, scorpions, bulls, headless humans) have been interpreted by Sweatman as zodiacal constellation markers and by other researchers (notably Necmi Karul and Klaus Schmidt) as ritual-iconographic elements without specific astronomical reference. Karul's published excavation reports in particular do not endorse the astronomical interpretations. The disagreement is unresolved. Any reader of this page who follows the Sweatman line should also read Schmidt's Sie bauten die ersten Tempel (2006; English translation They Built the First Temples, 2012) for the archaeological position that resists astronomical interpretation of the figurative carvings.

Further Reading