The Sky as Shared Referent: Symbolic Saturation, Independent Astronomical Encoding, and the Stellarium Evidence at Göbekli Tepe Reconsidered

The primary methodological objection to Sweatman and Tsikritsis’s (2017) astronomical interpretation of Göbekli Tepe’s Pillar 43 — and to its extension in Sweatman (2024) — is that retrocomputing the sky with Stellarium imposes modern Western constellation boundaries onto ancient symbolic systems, making the interpretation unfalsifiable and potentially circular. This paper argues that this objection misidentifies what Stellarium is doing. The software does not project modern categories; it reconstructs the actual historical sky — the same physical sky that Neolithic communities observed. The critical independent evidence for this reframing comes from Nabta Playa, a ceremonial site in the Eastern Sahara whose stone circle and megalithic alignment complex dates to approximately 4,800–3,000 BCE, with human occupation of the wider region extending to the 9th–8th millennia BCE. Located approximately 2,000 km from Göbekli Tepe and constructed by nomadic pastoralists with no documented contact with Anatolian communities, Nabta Playa independently demonstrates that pre-state communities encoding summer solstice sunrise and stellar rising points in durable megalithic form were not culturally anomalous but part of a broader behavioral pattern of astronomical externalization occurring across independent populations at broadly comparable stages of symbolic development. Drawing on the Deep Symbolic Systems Model (DSSM) and its Stage 3 symbolic saturation threshold, this paper argues that such independent convergence is not coincidental but predicted: communities facing seasonal coordination pressure will converge on the night sky as an optimal externalization substrate because it is universally accessible, seasonally stable, and cognitively salient to identical human perceptual systems. The convergence documented at Göbekli Tepe and Nabta Playa — and supported by the global distribution of Pleiades mythology (Norris and Norris, 2021) and Palaeolithic cave art correlations (Sweatman and Coombs, 2019) — constitutes empirical evidence for symbolic saturation theory’s convergence prediction, and reframes the Stellarium evidence: the carvers recorded the sky as they saw it. The paper makes no overclaims about the specific symbolic content of individual carvings; its argument is structural and comparative.