Scientific Observation of Harmonic Drift in Lunar Dates against Gregorian calendar

Astronomy is one of earliest sciences that continued to evolve, through its application particularly in monitoring its evolving time. This has been proven as powerful tool in pegging important events in the evolution of human civilization. One of such phenomena is the lunar movement and it’s implicating on lunar calendar, a template used by many countries around the world, notably Chinese, Jews and Muslim calendar. Observation shows that, dates in Islamic calendar, which are based on counting of days after first sighting of new crescent moon, at about 30 minutes after sunset, are mostly controversial. Considering the present advancement in science and technology, the controversy still persists and there is no available lunar calendar that is reliable for accurate longtime planning for Islamic activities. This resulted to lack of convincing Islamic calendar.