The lunar phases as we observe them are just the moon s cycle of day and night which repeats itself every 29-1/2 days.
(we; observe; them) (The lunar phases as we observe them; are just; the moon s cycle of day and night which repeats itself every 29-1/2 days) (the moon s cycle of day and night; repeats; itself; T:every 29-1/2 days)
we The lunar phases as we observe them the moon s cycle of day and night
observe are just repeats
them
the moon s cycle of day and night which repeats itself every 29-1/2 days
itself T:every 29-1/2 days