Pllzzz helppp why is a lunar year 10 or 11 days shorter than a solar year

"Their months are based on observations of the lunar cycle, with intercalation being used to bring them into general agreement with the solar year. ... Synodic months are 29 or 30 days in length, making a lunar year of 12 months about 11 days shorter than a solar year."

Explanation:

from wikipedia

Their months are based on observations of the lunar cycle, with intercalation being used to bring them into general agreement with the solar year. ... Synodic months are 29 or 30 days in length, making a lunar year of 12 months about 11 days shorter than a solar year

Explanation:

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