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Syzygy (sĭz’ə-jē)

n. pl. syz·y·gies

In broadest terms, Syzygy (IPA: /ˈsɪzɪʤi/) is a kind of unity, especially through coordination or alignment, most commonly used in the astronomical and/or astrological sense. Syzygy is derived from the Late Latin syzygia, “conjunction,” from the Greek σύζυγος (syzygos).

In astronomy, a syzygy is the alignment of three or more celestial bodies in the same gravitational system along a straight line. The word is usually used in context with the Sun, Earth, and the Moon or a planet, where the latter is in conjunction or opposition. Solar and lunar eclipses occur at times of syzygy, as do transits and occultations. The term is also applied to each instance of New Moon or Full Moon when Sun and Moon are in conjunction or opposition, even though they are not precisely on one line with the Earth . . .

(information obtained from dictionary.com and wikipedia.org)