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Work it out by basic dimensional analysis!

One (average) year = 365.24 days

One day = 24 hours

One hour = 60 minutes

One minute = 60 seconds

so there are 365.24 * 24 * 60 * 60 seconds in a year.

One nanosecond is 10**9 seconds so multiply the above answer by 10**9 (or just shift the decimal point 9 places, it's loads easier)

BTW this same approach can be used to convert any comparable sets of units, e.g. miles per hour into metres per second, or even furlongs per fortnight if you really want to try.

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17y ago

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