Why does earth rotation not provide a suitable time standard?

Why does earth rotation not provide a suitable time standard?
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The Earth is globe shaped, and the Sun can't illuminate the World at the same time. Therefore, the time is different as the World rotates. If the time was the same all over the World, when it was noon in daylight, it would be noon in darkness on the other side of the World. Standard time is maintained by making allowance for this differential using the Prime Meridian (zero longitude).
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