When water-cooled condensers are used fror distillation or for reluxing a liquid, the water enters the condensers at the lowest point and leaves at the highest, why?

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The major axis of earths orbit is 299,200,000 km, and the distance between the foci is 4,999,632km calculate the eccentricity of earths orbit. how does this value compare to the value noted in. the digging dipper?