Hourglass clocks were one of the very ancient clocks that we as humans made in our evolution in getting more accurate time. Humanity took centuries to stumble upon viewing time the way we do nowadays. When humanity was still a bit young we used to mark time by the rising and setting of the sun. And a month by the waxing and waning of the moon. But as we grew we built better and more precise ways of telling time. And, one of our earlier tries to this was "The Hourglass clock".http://www.skyringecraft.com/hourglass/
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