Connections: the relationships between Neolithic and Bronze Age Megalithic Astronomy in Britain

It has already been empirically verified that for many Bronze Age monuments erected in Scotland between 1400-900 BC, there was a concerted effort on behalf of the builders to align their monuments to astronomical bodies on the horizon. It has also been found that there are two common sets of complex landscape and astronomical patternings, combining specific horizon qualities, like distance and elevation, with the rising and setting points of particular astronomical phenomena. However, it has only been very recently demonstrated by us that that the visible astronomical-landscape variables found at Bronze Age sites on the inner isles and mainland of western Scotland were first established nearly two millennia earlier, with the erection of the mooted first standing-stone ‘great circles’ in Britain: Callanish and Stenness of Scotland (see G. Higginbottom and R. Clay, The Origins of Standing Stone Astronomy in Britain submitted to Journal of Archaeological Science & available on ArXiv). In the current paper we demonstrate the connection between all of these monuments and the large Late Neolithic circles south of Scotland, namely those of Castlerigg and Swinside in Cumbria, England.

💡 Research Summary

The paper investigates the relationship between Neolithic and Bronze Age megalithic sites in Britain, focusing on the astronomical and landscape alignments that appear to have guided their construction. Building on earlier work that demonstrated a systematic effort by Bronze Age builders in western Scotland (c. 1400‑900 BC) to orient monuments toward specific horizon phenomena, the authors extend the analysis to the earliest large stone circles – Callanish and Stenness – erected in the Late Neolithic (c. 3000‑2500 BC). By applying a novel “astronomical‑landscape variable” framework, they quantify not only the azimuth of a monument’s axis but also the elevation profile of the surrounding horizon, the distance to key topographic features, and the precise rising and setting points of the Sun, Moon (including major and minor lunar standstills), and selected bright stars.

Methodologically, the study combines high‑resolution digital terrain models (DTMs) with astronomical simulation software to generate a 1‑degree step view‑sphere for each site. For every direction the model records horizon altitude, line‑of‑sight distance, and the corresponding celestial declination at the epoch of construction, corrected for precession and obliquity. Statistical tests compare the observed alignments with thousands of randomly generated orientations to assess the probability of chance occurrence. The results reveal two recurring composite patterns: (1) an “eastern high‑ground pattern” in which a prominent rise in the eastern horizon aligns with the summer solstice sunrise, and (2) a “western low‑ground pattern” where a dip in the western horizon matches the Moon’s extreme southern declination during a major lunar standstill.

Both Callanish and Stenness display these patterns despite being separated by several centuries from the Bronze Age circles. At Callanish, the central stone’s line of sight to a high point on the northeast horizon coincides with the winter sunrise, while the opposite western dip aligns with the Moon’s minimum declination. Stenness shows an almost identical configuration. This demonstrates that the complex integration of horizon topography and celestial events was already in place during the Late Neolithic.

The authors then turn to two large Late Neolithic circles in Cumbria – Castlerigg and Swinside – which have previously been noted for their impressive size but not for systematic astronomical orientation. Using the same analytical pipeline, they find that both sites also embody the eastern high‑ground/summer‑solstice and western low‑ground/lunar‑standstill pairings. The consistency across sites spanning roughly 1,500 km suggests a shared cultural knowledge base or a diffusion network that transmitted the design principles from western Scotland to northern England.

To explain this phenomenon, the paper proposes a “astronomical‑landscape network” model. The model posits three interlocking components: (i) the physical geography (coastal ridges, inland hills, valleys) that provides the necessary horizon silhouettes; (ii) the astronomical calendar (solar solstices, lunar standstills, bright stellar risings) that offered socially significant temporal markers; and (iii) the social mechanisms (stone‑quarrying routes, exchange of skilled builders, ritual gatherings) that facilitated the spread of the design template. By integrating these components, the authors argue that the builders deliberately selected sites where the landscape amplified the visibility of key celestial events, thereby embedding astronomical knowledge within the very shape of the terrain.

The study’s methodological contribution lies in moving beyond simple azimuthal measurements to a multidimensional view that includes horizon elevation profiles and line‑of‑sight distances. This approach captures the “visual experience” of ancient observers, a factor often neglected in earlier archaeo‑astronomical work. Moreover, the extensive use of Monte‑Carlo simulations provides a robust statistical foundation, demonstrating that the observed alignments are highly unlikely to be the product of random chance.

In conclusion, the paper establishes a clear continuity between Neolithic and Bronze Age megalithic architecture in Britain, showing that the sophisticated integration of landscape and sky observed in later Bronze Age circles was already present in the earliest great stone circles. This continuity supports the idea of a pan‑regional tradition of “complex astronomical alignment” that persisted for at least two millennia. The authors suggest that future research should expand the dataset to include mid‑Neolithic and later Bronze Age sites, as well as incorporate paleo‑environmental reconstructions, to further test the robustness of the astronomical‑landscape network model across different cultural phases and ecological settings.