夏至係summer solstice (6月21),是二十四節氣之一. 太陽到達黃經90°時開始. 是最早被確定的一個節氣. 西元前7世紀,古人用土圭量日影,夏至這一天日影最短,因此把這一天稱作「夏至」. 古人早知日曆做咩唔用,用農曆差成咁多日? 農曆同猶太曆相似 hmm

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