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 A year is the total time taken by the Earth to orbit around the

Sun once.

 It takes the Earth 365 1/4th days (6 hours) to make one orbit
around the sun.

 But we calculate every year as only 365 and not the few hours

left.

 So, these leftover hours add up every four years and

eventually add one extra day to our calendar.

 So, adding a day every four years becomes a leap year.

Learning outcome: The child can differentiate between a normal
year and a leap year. He/she can explain about leap year like

why and how leap year happens.