"Umbra" means "shadow"; specifically the darkest part of the shadow of a planet or moon during an eclipse.
The umbra is associated with a total eclipse, penumbra with partial.
UMBRA
During a total solar eclipse, the shadow is called the umbra. It is the darkest part of the shadow where the moon completely blocks the sun. The umbra creates the area on the Earth where a total eclipse can be seen.
These areas are said to be in the umbra. From Britannica Online Encyclopedia (http://www.britannica.com/EBchecked/topic/613811/umbra): "in an eclipse of the Sun, the regions within the umbra experience a total eclipse and those within the penumbra, partial eclipse."
The Umbra
Not precisely. The umbra is the TOTAL part of the shadow. In a total eclipse, where the eclipsing object is spherical, then the "inner" part of the shadow is the umbra, but in a partial eclipse, there IS NO umbra; just the "penumbra", the partial shadow.
A total lunar eclipse.
A total lunar eclipse.
No, the umbra is the central, darkest part of a shadow where the light source is completely blocked. In the case of an eclipse, the umbra refers to the region of total darkness where the light source is completely obscured, such as during a total solar eclipse.
No, they see night-time. You can see a lunar eclipse (from anywhere) when the MOON is in the earth's umbra.
No, they see night-time. You can see a lunar eclipse (from anywhere) when the MOON is in the earth's umbra.
Within the moon's umbra.