Great question! It’s all about **Earth’s tilt**. Earth is like a spinning top that leans a little bit. It never stands straight up. As Earth goes around the Sun, that lean always points the same way. So sometimes your half of Earth leans **toward** the Sun, and sometimes it leans **away**.

Here’s a simple drawing you can show her:

```
        SUMMER in North America                 WINTER in North America
                 N                                       N
                  \                                       \
                   \                                       \
        SUN ☀ --- O                                       O --- ☀ SUN
                     \                                       \
                      \                                       \
                       S                                       S
```

See the stick through Earth? That’s Earth’s axis. The **N** is the North Pole. Notice the stick is tilted the same way in both pictures.

- In the **summer** picture, the North Pole leans **toward** the Sun. Sunlight hits the Northern Hemisphere more straight-on, like a flashlight pointing right at it. Days are longer. That makes summer.
- In the **winter** picture, the North Pole leans **away** from the Sun. Sunlight hits at a slant, like a flashlight shining from the side. Days are shorter. That makes winter.

The Southern Hemisphere (like Australia) has the opposite seasons. When we have summer, they have winter.

It’s **not** because we’re closer to the Sun. In fact, Earth is closest to the Sun in January, which is winter in the Northern Hemisphere!

Try this with her: Get a flashlight and a ball. Shine the flashlight straight at the ball → bright, small hot spot. Shine it at a slant → the light spreads out and is dimmer. That’s what the tilt does to sunlight.