A vocabulary of landscape — a landscape of words
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syzygy
The alignment of three celestial bodies in a straight line — most commonly the sun, earth, and moon. Syzygies produce eclipses (when the moon is between sun and earth, or earth is between sun and moon) and the extreme spring tides that occur at new and full moons.
Etymology
Greek syzygia, a yoking together, a conjunction, from syn- (together) + zygon (yoke). Three bodies yoked in a line.