Sentinel Rock is a rock formation in Arrakis. From Naib Dhartha's sietch, the Rock it seen as a thin spire of rock near the horizon. During the passage of the year, the constellation known as Beetle, drifts back and forth and crosses Sentinel Rock twice each year. This movement was used as a calendar by the Zensunni. AppearancesEdit Dune: The Butlerian Jihad (Mentioned only) Retrieved from "https://dune.fandom.com/wiki/Sentinel_Rock?oldid=32396" Categories: Arrakis Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.