The fact that the lunar phases repeat on the same solar dates about every 19 years (the Metonic cycle) can be used to __________.
a. predict the future orientation of the Earth's axis in space
b. keep lunar calendars approximately synchronized with solar calendars
c. predict the dates of future eclipses
d. keep the dates of solstices and equinoxes about the same from year to year
Ans: b. keep lunar calendars approximately synchronized with solar calendars
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