The lowest amount of solar energy per square meter is incident upon the surface of Earth in the northern hemisphere on or about A) December 21, the winter solstice. B) MarcH₂1, the vernal equinox. C) September 21, the autumnal equinox. D) June 21, the summer solstice.

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The winter solstice, which occurs on or about December 21st in the northern hemisphere, is the day with the shortest amount of daylight and the longest night of the year. This means that the sun is at its lowest point in the sky, and the northern hemisphere receives the least amount of solar energy per square meter compared to other times of the year. December 21 marks the winter solstice in the northern hemisphere, which is the day with the least amount of daylight hours and the lowest amount of solar energy per square meter incident upon Earth's surface.

The Lowest Amount of Solar Energy Per Square Meter Is