How phase of moon changes?

Dear Readers,
This article includes the basic facts about moon, our natural satellite.
It will fulfill your basic question.,
how phases of moon changes?
Hope you'll enjoy reading.

The Moon is the only natural satellite of the Earth, and the fifth largest satellite in the Solar System. It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having a quarter the diameter of Earth and ¹⁄₈₁ its mass.

The Moon completes its orbit around the Earth in approximately 27.3 days (a sidereal month). The Earth and Moon orbit about their barycentre (common centre of mass), which lies about 4700 km from Earth's centre (about three quarters of the Earth's radius). On average, the Moon is at a distance of about 385000 km from the centre of the Earth, which corresponds to about 60 Earth radii. With a mean orbital velocity of 1,023 m/s, the Moon moves relative to the stars each hour by an amount roughly equal to its angular diameter, or by about 0.5°. The Moon differs from most satellites of other planets in that its orbit is close to the plane of the ecliptic, and not to the Earth's equatorial plane. The lunar orbit plane is inclined to the ecliptic by about 5.1°, whereas the Moon's spin axis is inclined by only 1.5°.

Lunar Phases

The Moon appears to go through a complete set of phases as viewed from the Earth because of its motion around the Earth, as illustrated in the following figure.

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In this figure, the various positions of the Moon on its orbit are shown (the motion of the Moon on its orbit is assumed to be counter-clockwise). The outer set of figures shows the corresponding phase as viewed from Earth, and the common names for the phases.

Take a look at these video clips below, that might be help you to visualize what happen actually while phase change at the outer space. The first clip shows what the Sun, Earth, and Moon might be doing, as viewed from outer space. The  2nd clip shows you what you would see if you were looking up from your place.

I hope this information might helpful to you to understand how phase change actual occurs.

Now keep in mind this information while you see the moon in the deep dark night sky.

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.