Question

With the help of which natural phenomena's, one can take idea about the completion of one year?

Answer 1

revolution of earth on the sun's axis
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Answer 2

The natural phenomena which help us to understand the completion of a full year is change of seasons.

If you start counting the year with a single season, say summer, after the end of one year, you will again experience summer.

Thus by following the pattern of changing seasons, we can predict the passing of a year.