The Philosophy of Fasting in the Month of Ramazan

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 Follows 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.

Sense of Fasting (Spiritual aspects:)

Experience shows that a blind man has generally a stronger memory, and certain of his senses are more developed them those of an ordinary man who has sight. In other words, if certain faculties are not utilized. They may strengthen some other faculties. Similar is the relation between the body and the soul. In weakening the body there is strengthening of the soul (spirit), even as the pruning of the branches of a tree procures more flowers and more fruit. 

When an individual fasts, his conscience pricks him in the face of evil deeds, and he is more able to resist temptations. Further, the fast makes him think of God more, develops his inclination for charity, makes him taste the sweetness of obedience to the Lord.