“heliacal rising and setting”的概念、定义、翻译、参考文献-科学参考

单词	heliacal rising and setting
释义	heliacal rising and setting Astronomy The first visible rising of a celestial object in the morning sky after conjunction with the Sun; or the last visible setting of a celestial object in the evening sky before conjunction. The heliacal rising of Sirius was used by the Egyptians as a yearly marker for their calendar.
随便看	hydrostatic skeleton hydrostatic stress hydrostatic testing hydrostratigraphic units hydrosulphate hydrosulphide hydrosulphuric acid hydrothermal activity hydrothermal metamorphism hydrothermal mineral hydrothermal vent hydrotreating hydrotropism hydrovolcanic processes hydroxide hydroxides hydroxoacid hydroxonium ion hydroxyapatite hydroxycerussite hydroxyethanoic acid hydroxyl hydroxylamine hydroxylation hydroxyl group

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