blessed month

Ramadan is the holiest month in the Islamic calendar. It is this month that Allah (God) showers unlimited blessings to each Muslim. It is this month when all the Muslims around the world gather to pray together and celebrate this sacred month of sacrifice.  This month of fasting symbolizes the unity of all the Muslims. Then how is it that living in one country even in the same state, some Muslims are fasting a day earlier and some a day after? Are we not looking at the same moon to decide if the holy month of Ramadan has begun or not? Why are we not representing the true meaning of Islam?