lunisolar precession

20 LETTERS · STARTS WITH L

lunisolar precession is a valid 20-letter word worth 23 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

L1U1N1I1S1O1L1A1R1P3R1E1C3E1S1S1I1O1N1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does lunisolar precession mean?