They knew that a lunation (the time from one full moon | to the next) was 29 1/2 days long, so their lunar year had a duration | of 354 days.
(They; knew; that a lunation (the time from one full moon | to the next) was 29 1/2 days long, so their lunar year had a duration | of 354 days) Context(They knew,List([0, 9))):(a lunation; was; 29 1/2 days long)
They knew,List([0, 9))
They a lunation
knew was
that a lunation (the time from one full moon | to the next) was 29 1/2 days long, so their lunar year had a duration | of 354 days
29 1/2 days long