0 the dark inner part of a shadow in which all light is blocked, used especially about a shadow made during an eclipse -- 荫；阴影；（尤指日食发生时的）本影，暗影
At one extreme, in the umbrae of sunspots and pores, where the imposed field is strong and almost vertical, normal convection is substantially inhibited.
The diameter of the umbra does not decrease appreciably within the changes in the orbital distance of the moon.
Umbra is a being entirely composed of light, in nature and essence.
For a point source only the umbra is cast.
Umbra was never actually shown in any of the issues.
An observer in the antumbra, the area of shadow beyond the umbra, will see an annular eclipse.
It is a narrow path for the moon to pass within the penumbra and outside the umbra.
The spacecraft systems, and the scientific instruments, are located in the umbra of the shield.
