jan 1, 4000 BC - Earliest supposed dates for the domestication of the horse.
Description:
https://en.wikipedia.org/wiki/Domestication_of_the_horse#Archaeological_evidence - "Discoveries in the context of the Botai culture had suggested that Botai settlements in the Akmola Province of Kazakhstan are the location of the earliest domestication of the horse."Outram, Alan K.; et al. (2009). "The Earliest Horse Harnessing and Milking". Science. 323 (5919): 1332–1335. Bibcode:2009Sci...323.1332O. doi:10.1126/science.1168594. PMID 19265018. S2CID 5126719.
Added to timeline:
Date:
jan 1, 4000 BC
Now
~ 6029 years ago