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冬至

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The astronomical and meteorological periods of the four-seasons reckoning across the year at the Northern Hemisphere, displayed as segments of Earth's orbit. Astronomically a season encompasses the time between an equinox and solstice. Meteorologically seasons are quarters of the annual temperature cycle,[1] centered on the season characteristic temperatures, which trail equinox and solstice.

季節のメカニズム地球の傾きと公転がもたらす気候の変動

季節地軸の傾き公転春分
2026年8月11日続きを読む →
Sunrise in Brisbane Water National Park, Australia

昼の時間の仕組み緯度と季節がもたらす日照時間の変化

昼の時間日照時間地軸の傾き赤道
2026年8月10日続きを読む →