Page 44 - 89 history of astronomy_opt

We do know this, that all nations re-
quired to have a calendar. The solar year,
the lunar month, and the day were the units,
and it is owing to their incommensurability
that we find so many calendars proposed
and in use at different times. The only ob-
ject to be attained by comparing the chronolo-
gies of ancient races is to fix the actual dates
of observations recorded, and this is not a
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