Earth's Revolution Around the Sun

What causes the seasons.

1. Earth’s Revolution around the Sun ...and its consequences Mrs. Burch

2. Goal: I will understand what causes the seasons. http://www.planet-science.com/categories/under-11s/our-world/2010/09/four-seasons.aspx

3. From past lessons, you learned that the Earth rotates, causing day and night. http://scienceblogs.com/startswithabang/2010/09/17/but-it-moves-how-we-know-the-e/

4. You also learned that Earth is tilted about 23.5 degrees. http://www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/astronomy_space/ revision/5/

5. And, because of this tilt, some places on the planet get more direct sunlight than others, which makes these places warmer. https://planet-earth-2017.com/heat-not-from-the-sun/

6. Not only does the Earth rotate on its axis, but it constantly revolves around the sun, too. https://astronomy803.wikispaces.com/Earth+in+Space

7. So, what causes the different seasons?

8. Wait for it.....

9. It’s the tilt and revolution around the sun combined!

10. https://youtu.be/b25g4nZTHvM This video explains how they work together...

11. Northern Hemisphere Summer Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml

12. Have you ever noticed that in the winter, it gets dark sooner, and the sun doesn’t rise until later in the morning??

13. That’s because the hemisphere you live on is tilted away from the sun.

14. Because you are tilted away from the sun, the days will be shorter and the nights will be longer. January 1 10:02:48 hours of daylight July 1 14:16:01 hours of daylight

15. Conversely, days are longer in the summer and nights are shorter. January 1 10:02:48 hours of daylight July 1 14:16:01 hours of daylight

16. Longer days means your part of the world has more time to heat up in the day and less time to cool down at night.

17. https://youtu.be/KUU7IyfR34o Let’s review the effects of direct and indirect sunlight with Bill Nye the Science Guy.

18. https://youtu.be/82p-DYgGFjI Now, you know that the Earth revolves around the Sun. Does it revolve in a perfect circle? Watch this video for 30 seconds to find out! Please, keep in mind that the scale is exaggerated, so that we can better see how the earth revolves around the sun!

19. Cool Trivia:

20. Earth’s orbit is almost a perfect circle Earth is CLOSEST to our Sun (91 million miles) in winter —January 3 Earth is farthest from on our Sun (94 million miles) in summer –July 4

21. Seasons are reversed in the Northern and Southern hemispheres. When it’s winter in the Northern Hermisphere , it’s summer in the Southern Hemisphere, and vice versa.

22. The length of daytime and nighttime varies, depending on the time of year.

23. The North Pole and South Pole experience “Midnight sun” and days without any sunrise at all. https:// www.youtube.com/watch?v =7gN9jk3Fnr4

24. During the summer, the sun is visible from the North Pole (and near the North Pole) for a full 24 hours. Midnight in Norway

25. Conversely, from early October to early March, the sun is NOT visible from the North Pole (and near the North Pole) for a full 24 hours. The reverse occurs at the same time near the South Pole. Picture taken from Neumayer Station in Antarctica at noon.

26. True color images June December March September Images at http://www.nasa.gov/vision/earth/features/blue_marble.html

27. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Can you label the season in the northern hemisphere for each of Earth’s positions?

28. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Can you label the season for each of Earth’s positions?

29. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows summer in the northern hemisphere?

30. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows summer in the northern hemisphere?

31. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Why is it warmer for the northern hemisphere in this position? Use the words “ tilt ” and either “ direct sunlight ” or “ indirect sunlight ” in your explanation.

32. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Your explanation should sound something like this….

33. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml In this position, the Earth is tilted towards the sun. Therefore, the northern hemisphere is getting more direct sunlight , making it warm.

34. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Take turns with your team mates…Practice explaining why the northern hemisphere experiences summer in this position. Use the words “ tilt ” and “ direct sunlight ”.

35. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows winter in the northern hemisphere?

36. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows winter in the northern hemisphere?

37. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Take turns with your team mates…Practice explaining why the northern hemisphere experiences winter in this position. Use the words “ tilt ” and “ indirect sunlight ”.

38. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Your explanation should have sounded something like this….

39. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml In this position, the Earth is tilted away from the sun, so the northern hemisphere is getting more indirect sunlight . That’s why it’s colder.

40. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows fall in the northern hemisphere?

41. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows fall in the northern hemisphere?

42. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml How can you figure that out?

43. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Answer: Locate summer first. Fall comes after summer.

44. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows spring in the northern hemisphere?

45. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Which position shows spring in the northern hemisphere?

46. Image at http://www.lpi.usra.edu/education/skytellers/seasons/about.shtml Discuss with your team how you can figure that out.

47. How long does it take Earth to make one complete revolution around the Sun?

48. What is the difference between “revolution” and “rotation”?

49. https://mysteryscience.com/astronomy/sun-moon-stars-planets Watch this Mystery Science lesson to learn more about the sun and the seasons.