I understand why we have a leap year; to keep the sun and moon cycles in sync, so that Pessach is always in the spring.
That's all technical, as a result of the moon orbiting too slowly - or the sun too fast.
On a philosophical / theological level, why did Hashem create the world in such a way that a leap year is needed?
What does Hashem expect to achieve (or rather expect us to achieve/accomplish) with this extra month?
Surely there's some aspect of Avodat Hashem that depends (or can be improved) by understanding the point of the The Leap Year concept.