SYZYGY

Black and white or sun and moon

• Alignment of celestial bodies

• Alignment of the sun, earth and moon, e.g.

• Astronomical alignment

• Celestial line-up

• Eclipse cause

• Highest-scoring Scrabble word that doesn't use A, E, I, O or U

• Three celestial bodies in a straight line

• The straight line configuration of 3 celestial bodies (as the sun and earth and moon) in a gravitational system