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A solar term is any of 24 points in traditional East Asian lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon. The points are spaced 15° apart along the ecliptic and are used by lunisolar calendars to stay synchronized with the seasons, which is crucial for agrarian societies. The solar terms are also used to calculate intercalary months in East Asian calendars; which month is repeated depends on the position of the sun at the time. Solar terms originated in China, then spread to Korea, Vietnam, and Japan. This is exhibited by the fact that traditional Chinese, Hanja, and Kanji characters for most of the solar terms are identical. Because the Sun's speed along the ecliptic varies depending on the Earth-Sun distance, the number of days that it takes the Sun to travel between each pair of solar terms varies slightly throughout the year. Each solar term is divided into three pentads (候 ''hou''), so there are 72 pentads in a year. Each pentad consists of five, rarely six, days, and are mostly named after phenological (biological or botanical) phenomena corresponding to the pentad. == List of solar terms == # Simplified Chinese characters are shown in parentheses if they differ from the Traditional Chinese characters. # Hanja is indicated in parentheses. # Date can vary within a ±1 day range. The "Song of Solar Terms" () is used to ease the memorization of ''jiéqì'': ;Chinese: ;Pinyin chūn yǔ jīng chūn qīng gǔ tiān, xià mǎn máng xià shǔ xiāng lián, qiū chù lù qiū hán shuāng jiàng, dōng xuě xuě dōng xiǎo dà hán. měi yuè liǎng jié bù biàn gēng, zùi duō xiāng chā yī liǎng tiān shàng bàn nián lái liù, niàn yī xià bàn nián shì bā, niàn sān 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「solar term」の詳細全文を読む スポンサード リンク
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