that analysis of time was a lil short off mark and quite inadequate. great philosophers including the buddha were not able to define time, so that definitive answer on the flow of time was a lil haughty imo. ...................................................................................................... Zalim Ji, good to see you my friend. How are you doing? Your presence always gives me pleasure. Here we met again :). I value your comment. I have posted only scientific aspect of time, I am not aware of its any philosophical aspects. Please feel free to share if you know more about time; don't you think that I deserve to learn? :) To me time is a physical quantity, which is defined by people for their convinience. Every single difinantion is man made. Buddha was more scientist and less philosopher. As per my understanding he never talked about any philosophical things ever. Abhidhamma is more philosophical in Buddhis and many scholars doubt it to be Buddha's words. This is the line which divides Mahayana and Theravada. Buddha was very staright forward person. He hardly used any metaphors in his teaching because he believed those metaphors would create confusion. He was so straight forward and always considered philosophy as a hinder in the path of meditation. I remember one occasion when Buddha was asked how much time was "Kalpa" (eon). Buddha answered this way. "Bhikkus consider you have 1 Cubic Yojan (~64 mile^3) well full of mustard seeds. You throw away one seed in every hundred year. As long time as it takes to throw aways all the seeds of the well, Kalpa (eon) is even more than that time. Here also he is trying to define the time by event gap." In one occasion he said that to reach to the perfection it took 4 Ashankhey 1 Lakh Kalpa. It means he started journey to be Buddha 4 Ashankhey (10^19) 1 Lakh (10^5) Kalpa(eon) before. He said his name was Sugat Tapassi when he vowed that he would be Buddha one day. Here also time is the gap betwen two events; form Sugat Tapassi to Gautam Buddha, and it is measured in Kalpas. (Buddha's teaching is strongly based on Life after death, please forgive me if you don't believe on, it's just an example). If he were in modern day world, he would have said this much light year. Such a long time can be measured in logarithic power of light year. Whether the time is measured in Kalpas, or is measured by the velocity of light (light years) or is measured in revolution of earth around the sun (year) or by spinning motion of earth (day) or by sand flowing classical watches (Ghadi, Pala) or by Egyptian piller shadow clocks or by modern day electronic watches (s) or by the most accurate atomic watches; they all try to read the gap between two events, which is time. As relativity theory demands the velocity of light to be constant. Time is defined with respect to this fact. For example, 1 sec is the time taken by the light to travel about 300 million meter in vacuum. If you talk about reality, it is relative term. You and me are reality now were not reality 100 years ago and will not be reality 100 years later. Every thing in this universe is temporary, the whole universe is temporary. Only one thing is eternal in this universe, which is changing nature. Everything is changing in this universe. Everything is impermanent. Like bubble, bubble lives few second, we live few billion seconds, universe lives few billions billions billions billions... seconds. That's the only difference. No universe no time. Nothing. I am not much interested in theoritical stuffs which doesn't have any practicle aspect. Intellectual game doesn't lures me.