The nearest rough approximation, and one that seems to have been a common early choice, is 365 days and 12 1/3 lunar cycles (also 365 days if we alternate 29 and 30 day months) per solar cycle.
(one; to have been; a common early choice) (The nearest rough approximation, and one; is; 365 days and 12 1/3 lunar cycles) (we; alternate; 29 and 30 day months)
one The nearest rough approximation, and one we
to have been is alternate
a common early choice
365 days and 12 1/3 lunar cycles
29 and 30 day months