Accuracy in Time Keeping in the past

How accurate were human in keeping time before the atomic clock, which came into existence in 1955!

If there were a 10 percent off in time keeping, then human could be only in the 1800s now, if their forefathers counting was too slow or human could be in the 2200s if they count was too fast!

How reliable were their forefathers time keeping skills ? 

Last but not least, there were many inaccuracies in many areas in the past due to unreliable technology in the olden days!


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