LAST MONTH'S RIDDLE ANSWER IS:

"FULL MOON"

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ORIGINAL RIDDLE:
I’m a circle that changes, yet always return,
A lesson in cycles for those who will learn.
I govern the oceans with pull yet no hand,
A wanderer’s lantern not lit by the land.
I’m absent at times, yet at others I gleam,
The centerpiece shining in many a dream.
WHAT AM I ?