Why?

1. Why?

2. Why do we have 365 days in a year? Why do we have night and day? Why do we have seasons? THE MOON

3. Why do we have 365 days in a year?

4. Why do we have 365 days in a year? • The earth orbits the sun. • It takes 365.25 days for the earth to make one full orbit of the sun.

5. Why do we have 365 days in a year? • We have a leap year every 4 years to make up for the .25 of a day that we don’t count in a ‘regular’ year.

6. Why do we have day and night?

7. Why do we have day and night? • While the earth is rotating the sun, it is also spinning on its axis. • When we are facing the sun = daylight. • When we are not facing the sun = nighttime. • One rotation of the earth takes 23 hours 56 minutes.

8. Why do we have day and night?

9. Why do we have seasons?

10. The earth is tilted

14. Why do we have seasons? • Seasons arise due to the angle that the earth is tilted. • In summer, our part of the world is tilted towards the sun. • Sun is pointed at us for longer, our part of the earth gets warmer = hot weather • In winter, our part of the world is tilted away from the sun.

17. Questions Study the diagram below. Look at Ireland and Australia. aWhich country is in daylight? bWhich country is in darkness? cWhich country is having winter? dWhich country will have the longest period of daylight?

18. THE MOON

20. The Moon • The moon orbits the earth and takes 29.5 days to travel once around the Earth. • The moon also spins as it orbits the Earth. It takes 29.5 days to turn around once. • This means that we always see the same side of the moon – called the near side.