An Atmos clock consumes 60 million times less energy than a 15 watt electric light bulb. So the energy at its disposal is so small that for a long time it seemed impossible to add a complication to it. Undeterred, the Manufacture’s watchmakers have managed to meet this new challenge since 1990. The Atmos’s moon phase indicator mechanism is among the most accurate in history, with an error margin of one day in 3821 years!
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