the actual _duration_ of a year--or even of a month! We therefore divide
time into convenient units, as weeks, months, years and centuries
Probably no one has any very accurate feeling of the length, that is,
the actual _duration_ of a year--or even of a month! We therefore divide
time into convenient units, as weeks, months, years and centuries. This
allows us to think of time in mathematical terms where immediate
perception fails in its grasp.
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