amazing word for rare ecillipse

syz·y·gy

  [siz-i-jee]

noun, plural -gies.

1.

Astronomy. an alignment of three celestial objects, as the sun, the earth, and either the moon or a planet: Syzygy in the sun-earth-moon system occurs at the time of full moon and new moon.

2.

Classical Prosody. a group or combination of two feet, sometimes restricted to a combination of two feet of different kinds.

3.

any two related things, either alike or opposite.