synodic
/sɪˈnɑdɪk/
adjective
- Relating to the time it takes for a planet or moon to return to the same position relative to the sun, as seen from Earth.
- The synodic period of the Moon is about 29.5 days.
- Astronomers study synodic cycles to predict planetary alignments.
- The synodic month is longer than the sidereal month because of Earth's orbit.
Antonyms