Every people seen the Moon of Ramazan and Eid-Ul-Fitre (The Ebb and Flow of the Moon)

People are very keen to seen the Moon of Ramazan and Eid-Ul-Fitre.  It is the Moon of the first day. Can your describe its shape? Do the shapes at the end of first week and fortnightly Moon are similar to that of first day Moon? Does the shape of the Moon, in the sky, always look the same. One observing the shape of the Moon every night, we come to know that the shape of the Moon changes every night. The Moon of first day is so thin that it is very hard to see it. Its shpae resembles the sickle. It is called new Moon or "Hillal".

The ebb and flow (increase and decrease) of the Moon is actually due to its rotation around the earth.  As you know, Moon reflects the light of the Sun.  when the sunlight falls on that part of the Moon, which is opposite to the earth, then we cannot see it.  We see dim light of the Sun on the edge of the first day Moon. This is called new Moon or Hillal. In Fig.18.2, it has been shown at position number one. Similarly when Moon reaches the fifth position after passing through position number 2,3 and 4 during its rotation around the earth, its size gradually increases from the new Moon to the full Moon.  Then it gradually decreases and finally disappears.  In this way, the Moon completes its one cycle around the Earth.  The rotation of Moon arround the Earth has been shown if Fig.18.2.