The document discusses our solar system and the Earth's movement. It explains that the Earth orbits the sun over the course of 365 days, causing the seasons as different parts of the Earth receive more or less sunlight and heat throughout the year. The Earth's orbit around the sun is what defines a year, and the seasons of spring, summer, autumn and winter occur due to changes in the amount of sunlight between the Earth's hemispheres over the annual cycle.

1. THE UNIVERSE

2. Astronomical bodies

3. The Solar System

4. The Sun

5. The planets

6. Our planet

7. The Earth’s movement
• The Earth is moving around the Sun.
• This movement is called an orbit.
• The Earth takes about 365
days to complete the orbit.
This is a year

8. The Earth’s movement
• Orbit causes the seasons.
• When a part of the Earth receives more sunlight and
heat it is summer.
• In the other part
it is winter.
• Autumn is between
summer and winter.
• Spring is between
winter and summer.