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.

How Gear Ratios Work..?

You see gears in just about everything that has spinning parts. For example, car engines and transmissions contain lots of gears. If you ever open up a VCR and look inside, you will see it is full of gears. Wind-up, grandfather and pendulum clocks contain plenty of gears, especially if they have bells or chimes. You probably have a power meter on the side of your house, and if it has a see-through cover, you can see that it contains 10 or 15 gears. Gears are everywhere where there are engines and motors producing rotational motion. 
From this article you will learn about gears, gear ratios and gear trains so that you can understand what all the different gears you see are doing.

Gears are generally used for one of four different reasons:

1. To reverse the direction of rotation
2. To increase or decrease the speed of rotation
3. To move rotational motion to a different axis
4. To keep the rotation of two axis synchronized

Inside this Article

1. Introduction to How Gears Work
2. Understanding the concept of the gear ratio
3. Gear Trains
4. Other Uses for Gears 
5. To know more...click here