Pyramids engineered (3000 BCE +/- to 2000 +/- BCE) in a straight line and in parallel to the equinox of the Sun to Earth's equator line.
NFOSouce:"The Revelations of the Pyramids" YouTube documentary video (Mysteries of the world)

Americas Olmecs pyramids, EGPT; Giza pyramids, IRAQ; UR pyramids, IRAN; Tepe Sialk pyramids, CHINA; Shen-HSI pyramids.
Equinoxes is the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about 22 September and 20 March).

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