Adjective
of or pertaining to the region of partial shadow around an umbra
Source: WordNetA penumbral eclipse occurs when the moon passes through the Earth's penumbra. Source: Internet
During a penumbral eclipse, the moon is slightly obscured by the Earth's shadow. Source: Internet
Lunar Eclipse 2020: What is a penumbral lunar eclipse and how it occurs? Source: Internet
The total lunar eclipse lasts for four hours and five minutes, as the magnitude of the eclipse is -0.116, while the penumbral magnitude of the eclipse is 0.895. Source: Internet
In fact, penumbral eclipses with a penumbral magnitude of less than 0.60 usually go undetected by the naked eye. Source: Internet
Total penumbral eclipses are rare, and when these occur, that portion of the moon which is closest to the umbra can appear somewhat darker than the rest of the moon. Source: Internet