The Sun, Moon and Earth interact in a cycle which takes about 19 years to complete, so each solar year has a different pattern of moon phases until 19 years have passed, when the cycle returns (almost
(the cycle; returns almost; ) (a cycle; takes; about 19 years; to complete) (19 years; have passed; )
the cycle a cycle 19 years
returns almost takes have passed
about 19 years to complete