Sosigenes (English spelling)

Japanese: Sōsigenēs(英語表記)Sosigenes
Sosigenes (English spelling)

…As a result, as can be seen from the table, the fifth through tenth months, which are derived from numerals, were moved down by two months each, and came to refer to July through December. In 46 BC, the discrepancy with the solar year had reached 90 days, so Caesar invited Sosigenes of Alexandria to reform the calendar, first by replacing the aforementioned 90 days with the year 46 BC (which meant that the year had 445 days), and the following year, he introduced the Egyptian solar calendar, which has a year of 365 days. This created a leap year every four years, and added a leap day after February 23 (which the Romans called the 6th day before the first day of March). …

*Some of the terminology explanations that mention "Sōsigenēs" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…その結果,表からわかるように,数詞に由来する第5月から第10月までが2ヵ月ずつ繰り下がり,7月から12月を指すことになった。前46年に太陽年とのずれが90日に達していたので,カエサルはアレクサンドリアのソシゲネスSōsigenēsを招いて暦法の改革をはかり,まず前述の90日を前46年に置閏し(同年は445日あったことになる),翌年からは1年を365日とするエジプトの太陽暦を導入した。これは4年ごとに閏年を設け,2月23日(ローマの呼び方では〈3月の朔日に向かって第6日前〉)のあとに1日を置閏するものである。…

※「Sōsigenēs」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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