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The history of timekeeping is intrinsically linked to the development of human society. A carved bone found in the Semliki Valley in the Democratic Republic of Congo is thought to be the first instance of man recording the passage of days. If so, at 20,000 years old it is the earliest archaeological evidence of recording time, though this is disputed. Moon shaped pits have also been discovered in Scotland, dug 10,000 years ago, apparently to record the lunar phases. The earliest solid archaeological evidence of timekeeping, however, are the calendars used by the Egyptians and Babylonians 5,000 years ago. These were used to regulate and record religious and social events and track the passage of the seasons for farming.