The days become shorter and the nights becomes longer. One can see quite clearly,that even though there is no extreme temperature changes in the tropical country,the basic changes in the atmosphere does in fact take place. When the Sun enters into the Tropic of Cancer and the Tropic of Capricon, it causes nature to be slightly disturbed. The Sun does this at a period in time corresponding to Chaitra and Ashwin Nawraatri. Nature changes and not only does vegetation show physical changes but there are climatic changes too.
Climatic changes affects all living beings and organisms.
These changes in atmospheric temperatures,in one case from cold to warm and eventually hot and in the other case from hot to cool and eventually cold,creates and multiplies bacterial growth in the atmosphere and in our bodies. This is why we get the cold,the flu and the viruses when temperatures and seasons change. When this happens,we need nurturing and special care. Therefore,we offer prayers to God in the form of the Divine Mother or Shakti Mata for good health, strength,energy and spiritual growth. Goddess Durga is the feminine form of God incarnated as Shakti or cosmic energy.