Name several repititive phenomenon occuring in nature which could serve reasonable time standards.?


earth's rotation - 1 day.
earth's orbital revolution around sun (inferring stars) - 1 year.
moon's revolution around earth (between 2 similar phases full moon) - 1 (synodal) month.
pendulum swing of definite length. can't (by no means) called unnatural.
tuning fork, or strings of musical instrument give clear (monochrome) frequency depending on material, construction & on. such thing can designed 'a' frequency, reciprocal of 'time'. there many in genre, routinely designed men (engineers).
phenomena cs-133 isotope frequency.

physics fsc part 1 chapter 1


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