Why does the northern hemisphere experience summmer while southern hemisphere has winter?

reason due tilt of earth relative plane of revolution around sun. during northern hemisphere's summer (specifically, june 21), earth tilted 23.56 degrees toward sun meaning receives more sunlight , more energy southern hemisphere tilted 23.56 degrees away sun. opposite true during northern hemisphere's winter (specifically, december 21). reason shorter daylight hours during winter more surface area of earth's northern hemisphere left in shadow. opposite true longer daylight hours during summer - is, more surface area of earth's northern hemisphere lit sun not rotates on axis. during spring or autumn, both hemispheres receive same amount of light during corresponding equinox because tilt of earth tilted 0 degrees toward sun , away sun. (do not confuse mean earth has no tilt @ all, still has 23.56 degree tilt not directed either toward or away sun.)

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