heliacal rising

Japanese: heliacal rising(英語表記)heliacalrising
heliacal rising

… In ancient Egypt, every year when the Nile River began to flood, Sirius, the brightest star in the sky, became visible in the eastern sky before the sun. This fact was discovered as a result of many years of observation, and the Nile flood season was predicted by the heliacal rising of Sirius before sunrise. The Egyptian year, which was cultivated on the fertile land after the flood, consisted of a flood season, a sowing season, and a harvest season, and they were the first in the world to use a solar calendar. …

From Sirius

In ancient Egypt, she was called Sothis and was identified with the goddess Isis, and was especially worshipped. This star rose in the east just before sunrise, during what is called the heliacal rising, which coincided with the beginning of the flooding period of the Mother Nile. Temples to Isis were designed to align with the direction of the rising and setting of Sirius, and the start of the year was determined by observing the heliacal rising.

*Some terminology explanations that mention "heliacal rising" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 古代エジプトにおいて,毎年ナイル川が増水しはじめるころ,シリウスという全天でいちばん明るい恒星が太陽に先駆けて薄明の東の空に見えるようになる。多年にわたる観測の結果,この事実が発見され,ナイル川の洪水時期はシリウスの日出前出現(ヘリアカルライジングheliacal rising)によって予見された。洪水の去ったあとの肥沃の土地に耕作したエジプトの1年は,洪水期,播種(はしゆ)期,収穫期で成り立ち,世界で最初に太陽暦が使用された。…

【シリウス】より

…古代エジプトではソティスといい,女神イシスと同一視され,ことさら崇拝された。この星が日の出直前に東から昇る,いわゆるヘリアカル・ライジングheliacal risingのころが母なるナイルの氾濫(はんらん)期の始まりに一致していたからである。イシスの神殿はシリウスの出没方向に合わせて設計され,ヘリアカル・ライジングの観測によって年始を定めた。…

※「heliacal rising」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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