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In page Maeshowe:
"Tompkins, citing Thom[citation needed] and others, described in detail how Maeshowe, Silbury Hill[10] and other ancient mounds and Neolithic megaliths across Britain served as extremely accurate observatories, calendars, and straight-line beacons for travelers, as well as how they were used ceremonially in May Day celebrations more than 4000 years ago.
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