Types of eclipses
Solar Eclipse
Lunar Eclipse
We  view the illuminated object and watch it go dark.
Everyone on one side of the Earth can see the Moon – so a given lunar eclipse is visible to many people.
We view the illuminating object (the Sun) and see it blocked out.
Only a few people are in the right place to be in the shadow.
It is “coincidence” that the umbra just barely reaches earth.
From our text:  Horizons, by Seeds