syzygetic
/ˌsɪzɪˈdʒɛtɪk/
adjective
- Relating to or involving a syzygy (the alignment of three celestial bodies).
- Syzygetic conditions are necessary for a total lunar eclipse to occur.
- The syzygetic line of the sun, Earth, and moon creates the strongest gravitational pull.
- Ancient cultures often tracked syzygetic events for their calendars.