Share '"The Present Moment"'

How do you define it, The Present Moment ?. Its a value we are told by some is 'a mathematical impossibility. We are either approaching it, or moving away from it. (eg: 1 sec prior to....1/100000 seconds prior to until you get to 1/0, or 0, a 'value' or concept or we're told cant really exsist?. Does that mean the present moment never actually occurs? If it does, how long does it last? Where exac…