The invention of the clock that have developed gradually since modern Egypt post when 1 500 - 1,,300 B.C., the sundial was invented, but not Then honest because in the summer day is longer than the night, winter day is much shorter than the night, so the day of summer. The shadow of the sun cast.Morning to evening is longer than in winter, make descendants feel in summer hours are longer than ในฤด cold.
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