“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	second axiom of countability Second Battalion second beat second Bianchi identity second boundary condition second boundary value problem second Brillouin zone second Brocard Cevian triangle second Brocard circle second Brocard point second Brocard triangle Second Bulgarian Kingdom second category second category set second cementing interface second characteristic polynomial second class of ordinal numbers second comparison test second complementary law second component second conjugate space second contact second control second cosine formula second cosine theorem

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