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Egyptian royal cubit

Do you know what Egyptian royal cubit is?

Standards are developed and improved in accordance with the development of the unit they reproduce. In example, the first standard for length was defined, in old Egypt 3000 years BC. It is believed that there was a length unit – Egyptian royal cubit, registered in the scripts, as the first unit and the first, officially adopted, length standard.

The length of Cubit was equal to the length of the forearm plus the width of the palm of the ruling pharaoh. The royal cubit (standard) was made of black granite in order to "endure through all times". Cubit in the form of a stick, made of wood or common stone, was a measuring tool used bz hundreds of workers building temples, graves and other royal monuments. Ruling pharaoh brought a decision that each stick has to be compared to the royal cubit every time the moon is full. If anyone failed to obey, a horrific punishment followed:

"Anyone who forgets or neglects his duty to standardize his cubit, will be punished by death"

It clearly shows the significance that Egyptians gave to measuring and measuring standards. By regularly comparing cubit sticks to the cubit standard, Egyptians have achieved a high precision when building pyramids. This is how the sides of the pyramid in Giza, about 230 m long, were, to our knowledge, built with a precision of 0,05% of this length, which is approximately 0,1 m. Cubit had 28 digits, while 4 digits made a palm. Digit was divided into smaller parts by lines, and the smallest part of digit was 1/16. That system was in a way forerunner to a hexadecimal measuring system. It is assumed that the Egyptian measuring system was adopted by Greeks, during the time of Alexander the Macedonian (322 BC), and the Greek Olympic cubit was slightly bigger than the Egyptian cubit (link).