Portsmouth Earthworks, Group A, Portsmouth, Kentucky, USA

Dr Giles S. B. Hempstead https://commons.wikimedia.org/wiki/File:Portsmouth_Earthworks_map_Hempstead_1878.jpg
Portsmouth Earthworks map Hempstead 1878, marked as public domain, more details on Wikimedia Commons: https://commons.wikimedia.org/wiki/Template:PD-old

Facts

Vector is 90543.30899 / 30181.10298 = 3

Coordinates

True Longitude (Vertical, Giza, EAST<->WEST) x degrees, y minutes, z seconds West of Giza

30181.10298 = Multiplied True Longitude

Latitude (Horizontal, Equator, NORTH<->SOUTH) x degrees, y minutes, z seconds North

90543.30899 = Multiplied Latitude

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©2026 Tony Yustein

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