Card Set Information
Solar Luner Eclipses
What is the umbra?
the dark inner portion
What is the penumbra?
The lighter, outer portion
When does and eclipse occur?
WHen one object ( sun or moon) moves into the umbra or penumbra of the other objects shadow.
What is a luner eclipse?
the earth casts a shadow on the moon.
Why is a luner eclipse more common?
THe earth has a bigger shadow and it is easier to cover the moon.
WHat is a total Luner Eclipse?
the moon is completely in the Earth's umbra. It is comepletely darkened.
What is a partial luner eclipse?
the moon does not fully enter the earth's umbra.
WHat is a penumbral Eclipse?
the moon passes through only a little of the earth's penumbra. Thesr are hardly noticeable.