[LOCUTOR]

Track nineteen, unit nine, necessity is the mother of invention

[MULHER]

[…] Today, we are diving into time, and how humans developed technologies to measure it. Let's start with celestial bodies. Early civilizations like the Egyptians used the moon's phases to determine the length of a month. In prehistoric Europe, humans built stone rings called recumbent stone circles that would frame and track the moon in each of its phases. It's believed they were built for ritualistic purposes. Then we have the creation of the sundial, a device that shows the time using the sun's , depending on its position in the sky. The earliest archeological evidence of a sundial was found in the Valley of Kings in Upper Egypt in two thousand and thirteen and it dates back to fifteen handred BCE. A larger version of the sundial is the obelisk, which was used to mark the summer and winter solstices. […]