Relating to a syzygy, which is when three or more celestial bodies are in a straight line.
The word syzygetic is used in science and astronomy to describe the alignment of celestial bodies.
Examples:
The syzygetic alignment of the planets was a rare event.
The syzygetic relationship between the sun, moon, and earth affects tides.
The syzygetic arrangement of stars in the sky was beautiful.
The syzygetic dance of the planets was quite a sight!
The syzygetic conjunction of the stars created a spectacular show in the night sky.
The syzygetic pattern of the planets was amazing to see.