sentences: a complete revolution / orbit of the moon around the earth takes 1 / one month
docs: human_gestation is 10_lunar_months_280_days. moon is planet. lunar is spacecraft. earth has moon moon is about_400000_kilometres_from_earth. moon has phases moon's_orbital_period_around_earth is 28_days. moon is 238,000_miles_from_earth. lunar_month is month.