Starting c.250 BCE, the Adena encoded their knowledge of #seasons and celestial motions in sophisticated earthworks at what is now #MoundsStatePark, IN. #solstice & #equinox & stellar alignments

#NativeAmericanHeritageDay #astronomy #archaeology #archaeoastronomy #calendar #timekeeping #stargazing
photograph by DocRock via Megalithic Portal eGallery