“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	remote control remote-control arm frequency reuse frequency scaling frequency selectivity frequency shift keying frequency spectrum(of electromagnetic waves) frequency standard, primary frequency swing frequency(symbol: ν or f; unit: hertz) frequency synthesizer frequency table frequency theory of probability frequency transformation frequentist frequentist inference frequently asked question frequently asked question list fresh water fresnel Fresnel, Augustin Jean Fresnel diffraction Fresnel factor Fresnel lens Fresnel zone

科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。