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mooncalled mooncalled
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Around what date is the amount of solar energy per square metre that is incident upon the surface of the Earth in the northern hemisphere at its lowest level?



December 21, the winter solstice



March 21, the vernal equinox



June 21, the summer solstice



September 21, the autumnal equinox

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ASTRO

ASTRO


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yoyoguyyoyoguy
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