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The earliest Egyptians calendar was originally based upon the moon cycles but later the Egyptians noticed appearance of the Dog Star Sirius rose next to the sun every 365 days about when the flooding of the Nile began Based on this knowledge ancient Egyptians employed a 365 day calendar that seems to begun in 3100 BCE the earliest recorded in history years The ancient Egyptians were the first to replace their calendar with a solar calendar The evolution of our modern day calendar we use today was not a smooth process since it was adopted by the Egyptians and romansA merkhet involved a straight bar with a plumb line attached with weighted line on the end to measure a straight vertical line to the ground Two merkhets were aligned with North Star creating a north-south meridian By observing certain stars on meridian the time could be accurately calculated Obelisks can be used as a sundial When a shadow was created the position of shadow told the person how much daylight remained They had 12 markers around the base of the monument that equals 12 parts of dayWater clocks usually consisted of stone vessels having sloping side so that the water drips at a nearly constant rate in a small hole near the bottom Other water clocks known as clepsydras were either bowl shaped or cylindrical containers made to slowly fill water coming in at a constant rate Markings that are used show the passage of hours where the water is level with markings Another version of the water clock is metal bowl with a hole in the bottom as a container is filled with water the bowl will fill and sink in a certain time Mechanized water clocks became more accurate when tools were added to regulate the pressure of water making the flow more predictable These clocks were used to track night hours but may been used in daylight as wellJohn Harrison is famous
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