The tilt of earth's axis is much more important. The orbits of other planets, like Mars and Mercury, are not as circular as the orbit of Earth. For those planets the seasons are influenced by both the tilts of their poles and their changing distances from the sun. The seasons are basic to human life. They affect the foods we eat, our recreational activities, and what we wear.
Summer means shorts, swimming, baseball, strawberries and ice cream.
Fall means sweaters, football, corn, pumpkins and apples. Winter is the time for coats, basketball, skiing and oranges flown in from the tropics. Spring means light jackets, fishing, and gardening. It is the beginning of fall in the north. In America, this is when you clean up your ice skates and make sure your ski boots still fit.