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Nice, but the clock is artificial. In the Jewish scheme, the day starts at sunset (the beginning of night), so the sequence is night-day with no overlap. But night came first, because light from fusion had to wait for gravity
Hi lone77star. I agree. I gave my answer for the people who may not accept what they would classify as a "religious" answer.
The clock is not artificial. The world clock keeps time with the atom
Atomic clocks keep time better than any other clock. They even keep time better than the rotation of the Earth and the movement of the stars.