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The first mention of the gear was in 3000 BCE where Chinese travelers used 2 wheel chariots to cross the Gobi dessert . It used a "Wheel-mounted differential gear train mechanism " that used wooden pin teeth and would operate an outstretched arm that would keep momentum .- American Scientist -
It was a combination of the waterwheel and transmission linkage which had gearing . the first one was a vertical wheel with paddles that went on using the stream - Britannica -
It was a ancient gear assembly called the "Antikythera mechanism " most likely used to predict the places of the sun and moon as well as when the Olympic and Panhellenic games were to be hosted . It used a small hand crank that connected to a crown gear that rotated interlocked gears.- American Scientist -
The Salisbury Cathedral clock is the oldest gear operated clock and it is credited to Ibn Khalaf al Murādī .-SIRS discovery -
When people started to use complex math like velocity ratios and involute curves so they also found out more ways for gears-American Scientist -
It is a way to change the speed and torque . they rotate around a sun gear hence the name . they also move around a ring gear with teeth inside .