Varianten
Umbra |
umbra
umber
raw umber
|
Kernschatten |
umbra
|
Varianten
When the Moon is fully immersed in the umbra a total lunar eclipse occurs.
But the penumbra is so faint that it cannot be recognized until just before the Moon enters the Earth's dark central shadow, the umbra .
The Moon can then pass through a part of the umbra (region of total shadow) and then there is a partial eclipse.
While it is entirely within the umbra the lunar disk brightness drops to about one part in 5,000 that of the near-full moon, and so it can still be seen.
The umbra is a central cone of darkness which tapers away from the Earth or Moon.
Other