What causes Earth to have seasons?

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1 Seasons

2 What causes Earth to have seasons? The distance to Earth does NOT cause seasons seasons are caused by : 1. the tilt of the earth on its axis (23.5 degrees) 2.revolution of earth around the sun 3. parallelism

3 1. Tilt of Earth s axis 23.5 degrees

4 2) Sun s rays are parallel to each other when they reach the curved surface of the Earth

5 3. Earth s axis always points in the same direction (towards Polaris) as it revolves. Known as Parallelism

6 When the north pole is tilted towards the sun, it is our SUMMER! measurement/v/earth-s-tilt-1-the-reason-for-the-seasons

7 Seasons: Caused by 1) 2) : Date: Direct Rays: Day Length: : Date: Direct rays: Day Length: Earth s distance from sun known as the. : Date: Direct rays: Day Length: Earth s distance from sun known as the :. Date: Direct Rays: Day length: Earth s axis points in the same direction (towards Polaris) as it revolves. Known as.

8 Seasons: Caused by 1) Earth s tilt (23.5) 2) Earth s revolution Vernal Equinox: Date: March 21 (1 st day of Spring) Direct Rays: Equator Day Length: 12 hours day/night (everywhere) Summer Solstice: Date: June 21 (1 st day of Summer) Direct rays:23.5 N Tropic of Cancer Day Length: 15 hrs in NYS Earth s Furthest distance from sun known as the Aphelion position Winter Solstice: Date: December 21 (1 st day of winter) Direct rays: 23.5 S Tropic of Capricorn, Day Length: 9 hrs in NYS Earth s closest distance from sun known as the Autumnal Equinox: Perihelion position. Date: September 21 st (1 st day of Fall) Direct Rays: Equator Day length: 12 hours day/night (everywhere) Earth s axis points in the same direction (towards Polaris) as it revolves. Known as Parallelism.

9 Equinoxes & Solstice?

10

11

12 Final Questions

13 Seasons: Caused by 1)Earth s tilt (23.5) 2)Earth s revolution Add in the equator, Tropic of cancer and Tropic of Capricorn

14 Summer Solstice: Date: June 21 1 st day of Summer Axis tilted towards Sun: North Pole Direct rays Tropic of Cancer, 23.5 N Earth s distance from sun: Furthest (Aphelion position) Day Length 15 hrs in NYS Sun

15 Caused by revolution / tilt 23.5 o N Northern Hemisphere Summer Solstice: June 21 Sun Autumnal Equinox: September 21

16 Sun Autumnal Equinox: September 21 1 st day of Fall Direct Rays- Equator Day length - 12 hours day/night (everywhere)

17 Caused by revolution / tilt 23.5 o N Northern Hemisphere Summer Solstice: June 21 Winter Solstice: December 21 Sun Autumnal Equinox: September 21

18 Sun Winter Solstice: December 21 1 st day of Winter North Pole - away from Sun Direct rays -Tropic of Capricorn, 23.5 S Earth closest to Sun in orbit (Perihelion) Day Length 9 hrs in NY

19 Caused by revolution / tilt 23.5 o N Northern Hemisphere Vernal Equinox: March 21 Summer Solstice: June 21 Winter Solstice: December 21 Sun Autumnal Equinox: September 21

20 Vernal Equinox: March 21 1 st day of Spring Direct Rays = Equator Day Length - 12 hours day/night (everywhere) Sun

21 Caused by revolution / tilt 23.5 o N Northern Hemisphere Vernal Equinox: March 21 Summer Solstice: June 21 Winter Solstice: December 21 Sun Autumnal Equinox: September 21

22 Seasons: Caused by 1) 2) Vernal Equinox: Date: Direct Rays: Day Length: Summer Solstice: Date: Direct rays: Day Length: Earth s distance from sun known as the. Winter Solstice: Date: Direct rays: Day Length: Earth s distance from sun known as the Autumnal Equinox:. Date: Direct Rays: Day length:

November 20, NOTES ES Rotation, Rev, Tilt.notebook. vertically. night. night. counterclockwise. counterclockwise. East. Foucault.

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