Any repetitive phenomenon occurring in the nature can be
used as time standard.
Standard time unit
Do you know what it means to be a time unit?
Our present time unit is second. We know it has a clear definition. If human pulse is chosen to be a time unit, then it will be the time for one heartbeat, and instead of second, might have name like 1 beat etc. Similarly, if pendulum is chosen to be a unit standard, then instead of seconds, we might be saying as 1 period time or 2 period time!
(Example of constantly repeating phenomenon in nature may be the revolution of earth around the sun). Human pulse and pendulum (time period of) are of them.
However, to choose any such phenomena as time standard needs them to be uniform, unaffected in a particular environment and easily accessible. Human pulse and pendulum do not fulfill this criteria.
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