Time is inevitable. It is the essence without which reality has no meaning. It is inseparably woven in the fabric of universe, chronicling its history every moment: inflation of universe since beginning, formation of galaxies from cosmic dust, creation of elements in the nuclear furnace of stars, origin of organic life from these elements on a miniscule planet, evolution of complex organisms which ruminate on the nature of the phenomenon of time. Movement of cosmic bodies in our vicinity give us the measure of time: rotation of Earth on its axis, its revolution around Sun, Moon’s revolution around earth. We are born with a biological clock which is aligned to this astronomical clock. It regulates physiological processes and behavioural patterns. Though these two clocks are synchronized, biological clock keeps ticking independently of the external clock. This explains the jet-lag after a long intercontinental flight across many longitudes. Plants and animals too, it would seem, have