What Is a Lunar Eclipse and HOW it works?

So what is a lunar eclipse? 
These eclipses are actually remarkably simple considering how interesting and dynamic they can be. Basically, the Earth's shadow blocks most of the sunlight from directly illuminating all -- or a portion -- of the moon's surface.

Digital composites like this one are becoming popular
ways to capture the progression of phenomena like lunar eclipses

The moon has been Earth's trusty sidekick for billions of years. And as it endlessly cruises around our planet, once in a while this scrappy satellite precisely aligns within Earth's shadow, taking on an eerie, reddish glow. And what's this phenomenon known as? A lunar eclipse, of course.   

Earth generates two cone-shaped shadows: The umbra is the dark, center shadow, and the outer, more diffused one is known as thepenumbra. The penumbra encases the umbra. Both these cones are cast out from behind the sunlit side of the planet. Consequently, lunar eclipses only occur during the full moon phase(when the moon and the sun are on opposite sides of the Earth). Solar eclipses are possible only during the new moon phase (when the moon plays "monkey in the middle" between the sun and Earth).

Inside this Article

1. Introduction to How Lunar Eclipses Work
2. What Is a Lunar Eclipse?
3. Classifying Lunar Eclipse
4. To know more ..click here

3 Common Reasons which reveals that EARTH is SPHERE...

If you didn't know that the Earth is a sphere, there are three common observations you could use to convince yourself that it is.

• The first common observation is the shape of the moon. First, the face of the full moon is circular, and that would lead you to believe that it is a sphere rather than a disc. When the moon eclipses the sun, the shape of the shadow is always circular, which clinches a spherical shape for the moon. By extrapolation, you could assume that the Earth is a sphere also.

• Also notice that when the moon is being eclipsed by the Earth (a lunar eclipse), the part of the moon that is eclipsed is actually the shadow of the Earth. This shadow tells you that the Earth is a sphere just like the moon.
• A third way to see that the Earth is a sphere is to look at how objects in the distance "disappear" as you get farther away. For example, a 100-foot-tall ship that is 15 miles away is not visible. That's because it is blocked by the curvature of the Earth. As it approaches, it "rises." First the tip of the mast is visible, then more and more of the ship comes into view as the ship gets closer.