Why we have summer and winter Earth orbits the Sun with a constant 23.5-degree tilt; when the North Pole leans toward the Sun it is summer in the north, when it leans away it is winter. N S the Sun 23.5° SUMMER — June North Pole leans toward the Sun! WINTER — December North Pole leans away from the Sun! SPRING — March neither pole leans toward the Sun FALL — September neither pole leans toward the Sun Earth's orbit — one full trip = one year Why do we have summer and winter? Because Earth is tilted 23.5° — and its tilt always points the same way as Earth orbits the Sun! N = North Pole, S = South Pole. The tilted axis always points the same way all year long! Lean toward the Sun → summer (direct light, long days). Lean away → winter (slanted light, short days). The Southern Hemisphere gets the opposite season — and sizes & distances are not to scale! Here's a diagram you can open and show her. A simple way to walk her through it: - **Earth is like a spinning top that leans a little** (23.5°) — and it keeps leaning the *same direction* the whole trip around the Sun. - Point to the **left Earth**: "See how the North Pole leans *toward* the Sun? That's our summer — sunlight hits us more directly, like a flashlight pointed right at you." - Point to the **right Earth**: "Six months later, we're on the other side and the North Pole leans *away*. The light hits at a slant, like a flashlight from the side — that's winter." - Bonus: the orange/blue halves show that **summer and winter are opposites** — when it's summer up north, it's summer *down under* too... just flipped! The flashlight analogy usually clicks really well at this age — if you have one handy, shine it straight down on the table vs. at a slant so she can see the light spread out.