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並前往https://theconversation.com/day-and-night-arent-equal-length-on-an-equinox-heres-why-157273

Day and night aren't equal length on an equinox – here's why

Around 20 March we have the vernal equinox or March equinox, also known as the spring equinox in the northern hemisphere. Then around the 22 or ...

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