... 本影闪烁 黑子numbral flash 本影食 umbral eclipse 比(动量)矩 即角动量密度nspecific moment of momentum ...
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Usually annular eclipses are referred to solar eclipses, as Earth's umbral shadow is always large enough for the whole Moon to hide inside during a lunar eclipse.
在日月食中,因为地球的影子比月球大得多,所以只会有日环食而没有月环食。
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