Namoratunga, a megalithic site in northwestern Kenya, has an alignment of 19 basalt pillars that are non randomly oriented toward certain stars and constellations. The same stars and constellations are used by modern eastern Cushitic peoples to calculate an accurate calendar. The fact that Namoratunga dates to about 300 B.C. suggests that a prehistoric calendar based on detailed astronomical knowledge was in use in eastern Africa.
References:
https://www.ncbi.nlm.nih.gov/pubmed/17743241



References:
https://www.ncbi.nlm.nih.gov/pubmed/17743241
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