The Philosophy Of Fasting in The Month Of Ramadan

Why Muslims follow a purely lunar calendar for fasting?

Normally the fast should not affect the daily avocations, and it should not be a pretext for neglecting normal duties. Islam never approves, much less demands, of keeping vigil during the whole night and passing the following day in sleep and indolence. Fast means a greater effort to perform all the usual duties and something else, more prayers and more charity, and all this in the absence of food and drink.

THE REASON WHY MUSLIMS FOLLOW A PURELY LUNAR CALENDAR IN THE MATTER OF FASTING 

Jews, Christians and Hindus have a solar year, either directly or a lunar year with intercalation, so that the time of fasting always falls in the same season. Muslims follow a purely lunar calendar, and consequently their month of fasting. Ramazan. Rotates gradually in all the seasons of the year.