A timeline based on 30 days would have been very close to the calendar used in Egypt at the same time
In the south-west of England the prehistoric Stonehenge stone circle has long been thought to be related to the measurement of time.
The clearest evidence has been the placement of the perimeter stones so that on the morning of the summer solstice, the Sun rises exactly from the gap left between the two stones. The opening is slightly wider than the other openings in the perimeter.
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