Answer: syzygies

AnswerCrossword Clue
syzygiesgroup or combination of two feet, sometimes restricted to a combination of two feet of different kinds
syzygiesSYZYGY, the configuration of the earth, moon and sun lying in a straight line
syzygiesany two related things, either alike or opposite
syzygiesalignment of three celestial objects, as the sun, the earth, and either the moon or a planet