半はん影えい

noun, noun which may take the genitive case particle 'no'

penumbra

Astronomical term for the partially shaded outer region of a shadow, especially during an eclipse. Also used as a no-adjective.

• 月げっ食しょくでは、半はん影えいに入はいった部ぶ分ぶんが少すこし暗くらく見みえる。

  During a lunar eclipse, the part that enters the penumbra looks slightly darker.

• 半はん影月えいげっ食しょくは肉にく眼がんではわかりにくい。

  A penumbral lunar eclipse is hard to notice with the naked eye.