Lū'ni-sō'lar, a.

a. [Lat. luna, the moon, and solaris, belonging to the sun, from sol, the sun; It. lunisolare, Sp. lunisolar, Fr. lunisolaire.] Resulting from the united action, or pertaining to the mutual relations, of the sun and moon.

Lunisolar precession (Astron.), that portion of the annual precession of the equinoxes which depends on the joint action of the sun and moon.—Lunisolar year, a period of time, at the end of which the eclipses return again in the same order. It consists of 532 common years, and is found by multiplying the cycle of the sun by that of the moon.