The simple answer is: **because Earth is tilted like a wobbling top, and as we go around the Sun, that tilt means the sunlight hits us at different angles.**

Here is a drawing she can picture. Imagine looking at Earth from the side while it travels around the Sun:

```
         North Pole always points the SAME direction in space
         (like a top leaning over):
         
              |              |              |
              |              |              |
              v              v              v
         
           ,-------.      ,-------.      ,-------.
          /   |    \      /   ^   \      /   |    \
         |    |     |    |    |    |    |    |     |
          \   |    /      \   |   /      \   |    /
           '-------'      '-------'      '-------'
         
          SUMMER                        WINTER
          (North)                       (North)
          North leans                   North leans
          TOWARD the Sun                AWAY from the Sun
          
          Sunlight hits                 Sunlight hits
          straight on.                  at a steep angle.
```

### The 3 things to point out on the drawing:

1. **The leaning is always the same way.** The North Pole doesn’t wobble back and forth between seasons. It always points in the same direction in space (toward the North Star).
2. **When we’re on one side of the Sun,** that lean points the top of Earth toward the Sun. The Sun’s light hits us almost straight down. Days are long, the light is strong, and it’s **summer**.
3. **Six months later, we’re on the other side of the Sun.** The same lean now points the top of Earth *away* from the Sun. The light hits at a low angle, days are short, and it’s **winter**.

### The best way to make it “click”: the Orange & Lamp trick

Grab an orange (or a ball) and a flashlight/lamp in a dark room.

1. Poke a pencil through the orange so it’s tilted (not straight up and down). That’s Earth’s tilted axis.
2. Walk in a circle around the lamp, but **keep the pencil leaning the same direction the whole time** (don’t spin it to face the lamp).
3. When the top of the orange leans toward the lamp, the light is bright and warm on that half → **summer**.
4. When the top leans away, the light is weak and slanted → **winter**.

### One myth to squash right now
Many kids (and adults!) think winter happens because Earth is farther from the Sun. **That’s not true.** In fact, Earth is actually slightly *closer* to the Sun in January! Seasons are caused by **tilt and angle**, not distance.

**Bonus fun fact for her:** While it’s winter for us, it’s summer in Australia, because they’re on the other half of the planet leaning toward the Sun at the same time.