moon enters umbra 中文意思是什麼
moon enters umbra
解釋
月偏食始-
Moon enters umbra : instant of first external tangency of moon with the umbra
初虧:月球由東緣慢慢進入地影,月球與地球本影第一次外切。 -
" moon enters umbra " - when the moon enters the earth s umbra, this is the start of partial lunar eclipse
月球剛剛和半影接觸時稱為半影食始月球同本影接觸時稱為初虧,這時月偏食開始 -
The date showed in the table is the time for the " moon enters umbra " or the " moon enters penumbra "
如屬月全食或月偏食,標明時間為初虧至復圓如屬半影月食,標明時間為半影食始至半影食終 -
When the moon totally enters the umbra the full shadow of the earth, it is a total lunar eclipse ; when only part of the moon passes into the umbra, it is a partial lunar eclipse ; as to the penumbral lunar eclipse, it describe a phenomenon when the moon only enters the penumbra the partial or incomplete shadow of the earth
當月球只有部份進入地球的本影時,便會出現月偏食而當整個月球進入地球的本影內時,便會出現月全食至於半影月食,是指月球只是掠過地球的半影區,造成月面的光度極輕微減弱,很難用肉眼發覺有甚麼分別,因此不為人所注意。 -
Sometimes the moon only enters the penumbra without touching the umbra. this is a penumbral lunar eclipse
有時月球並不會進入本影而只進入半影,這就稱為半影月食。
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