What does a complete blood count measure? A CBC measures the amount of 3 types of cells in your blood: White blood cell count. A white blood cell count, also called a leukocyte count, measures the total number of white blood cells in a sample of blood.
In the umbra, the light from the Sun is completely blocked by the Earth. Our lunar observer would see a total solar eclipse; we see the Moon darkened, but glowing a dull red from light scattered by the Earth's atmosphere.
The easiest way to see this is during a solar eclipse, when the Moon passes in front of the Sun. With high-resolution imaging, you can clearly see the shadows, but thereâs a particular time that you can see an incredible effect with nothing more than a pair of eclipse glasses or welderâs shades. During a total solar eclipse, either right before or right after totality, the Moonâs disk nearly â but not entirely â blots out the Sun.