1. Earth as a cosmic matter

2. The Solar System

3. Desk or round shape? Elliptical orbits? The Sun-Centre of the Universe? Heliocentric system Gravitation Mikulas Kopernik Johannes Kepler Issac Newton

7. Different Climatic Zones

8. About 4.75 billion years ago…

9. …out of solar nebula

10. Weight: 80 times smaller Distance:60 times Earth’s radius

11. Important sunlight

12. Ocean tides

13. Earth’s rotation around the Sun The Sun The orbital speed: 30km/sec The length: 940mil.km The time: 365days 5hours 48min 45.7sec = 1sidereal year

14. Earth’s rotation around its axis Time of rotation: 23 hours 56 minutes 4.091 seconds = 1 sidereal/astral day

15. The cause of the seasons is that the rotation axis is not perpendicular to its orbital plane, but makes an angle about 23.44 degrees.

17. Diagram of the Earth's seasons as seen from the north. Far right: December solstice

18. Diagram of the Earth's seasons as seen from the south. Far left: June solstice

19. Time zones