Synodic month — Science definition
Average new-to-new lunar phase cycle of about 29.5 days; distinct from the approximately 27.3-day orbit relative to distant stars.
Where it is taught
- Earth, Moon & Sun: Moon Phases — Earth, Moon & Solar System, Earth & Space Science, Grade 9
In use
5 days — one new-to-new illumination cycle, called a synodic month; the Moon’s orbit relative to distant stars takes about 27.
Earth, Moon & Sun: Moon Phases