Wednesday, November 17, 2010

MOON AND PHASES OF MOON

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Moon is the natural satellite of Earth. It rotates around the earth on its axis, it complete its one rotation in 29.4 days and this time period is called lunar month. The moon does not have its own light, it gets the light from sun which is reflected from its surface, if we talk about its surface, it is very rough, it is not very smooth, it has so many holes, mountains, valleys on its surface, the mountains are very high and sharp. Holes are made by heavenly bodies which strikes on its surface during space troubles. A long narrow valleys on the moon is called rills and the deep holes on the moon surface is known as  craters. If we have 48 kg weight on earth, then on moon, it will be 8 kg, so what is the difference if something loose in our body, when we went to moon, answer is - certainly not, it is the force of gravity due to which our weight will become less as moon has 1/6th gravity of that of earth.




Phases of Moon


We can see moon daily in the sky at night and we also notice that its shape is always differ from the previous one, day by day,  So this changes in the shape of the moon is called phases of moon. There are two main phases of moon known as


NO MOON- When the moon is completely dark just because of no sunlight falls on its surface, according to its rotation time period, is known as No moon phase


FULL MOON- When the moon is completely bright, is called full moon.


The condition in which size of the moon is increasing is called waxing on the 4th day, less than one half portion of the moon is visible is called waxing, creacent,

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