![]() The gear ratio isn’t perfect - calculates its drift to be 20 hours over a year -but it’s close enough for the clock’s given purpose of being a cool thing. There’s a three-stage planetary gear reduction which turns a date wheel connected to the black shroud so that the clock remains accurate throughout the year. The Earth is rotated within a black shroud such that the current portion of the Earth seeing sunlight is the visible section on the clock, while the rest is hidden from view. The build consists of an Arduino Nano driving a stepper motor, which turns a 3D printed model of the Earth through 360 degrees each day. This 3D printed Earth clock built by promises to do just that. However, few can give us an intuitive sense of how far away we are from the enveloping cloak of night. ![]() ![]() Plenty of clocks around us are useful for telling us the precise hour, minute, and second of the day. ![]()
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