“ancient.sunspot observation”的概念、定义、翻译、参考文献-科学参考

单词	ancient.sunspot observation
释义	ancient.sunspot observation Encyclopedia 理学太阳物理学释 ancient.sunspot observation太阳黑子的古代观测在望远镜发明以前直接用肉眼观察日面上的黑子现象。在一般情况下，由于太阳光十分刺眼，看到这种现象的机会不多。但在日出或日落时，或在大雾笼罩或风沙弥漫的天气，日光减弱，就有可能看到日面上的大黑子。
随便看	effective dose effective elastic thickness effective enumeration effective equivalent dose effective equivalent dose rate effective error mean square effective field effective field theory effective filter response effective filtration pressure effective flow resistance effective f-number effective focal length effective focal spot effective focus length effective formal deformation Effective Formulae Handed Down for Generations effective frequency range effective fuel consumption effective functional effective genus effective group effective group action effective Hamiltonian effective height

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