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The Earth and its Motions Science 8 Astronomy Notes Page 6.

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1 The Earth and its Motions Science 8 Astronomy Notes Page 6

2 The Earth and its Motions The Earth rotates or spins on its axis The Earth rotates or spins on its axis The rotation time is 24 hours or 1 day The rotation time is 24 hours or 1 day

3 The Earth and its Motions The Earth revolves or travels around the sun The Earth revolves or travels around the sun The revolution time is 365 ¼ days or 1 year The revolution time is 365 ¼ days or 1 year Ever wonder what leap year is or why is there are 29 days this month? Click here…Click here

4 The Earth and its Motions The Earth does not stand straight up on its axis The Earth does not stand straight up on its axis The Earth is tilted at an angle of 23 ½° on its axis. The Earth is tilted at an angle of 23 ½° on its axis. Why is 23 ½° North or South of the Equator significant?

5 Putting it all together… What causes day and night? What causes day and night? The Earth’s rotation and its spherical shape causes half of the Earth to face the sun (day) and half to face away (night). NIGHT DAY

6 Putting it all together… What causes seasons? What causes seasons? The Earth’s revolution and its tilt on its axis causes the sun to hit certain parts of the Earth more directly (summer) and parts less directly (winter).

7 The Winter Solstice Is the 1 st day of winter Is the 1 st day of winter Minimum hours of daylight Minimum hours of daylight Happens around December 21 st (in the Northern Hemisphere) Happens around December 21 st (in the Northern Hemisphere) Most direct rays hit south of the Equator (at 23 ½° S)

8 The Summer Solstice Is the 1 st day of summer Is the 1 st day of summer Maximum hours of daylight Maximum hours of daylight Happens around June 21 st (in the Northern Hemisphere) Happens around June 21 st (in the Northern Hemisphere) Most direct rays hit north of the equator (at 23 ½ °N)

9 The Vernal Equinox Is the 1 st day of spring Is the 1 st day of spring Equal hours of daylight and darkness Equal hours of daylight and darkness Happens around March 21 st (in the Northern Hemisphere) Happens around March 21 st (in the Northern Hemisphere)

10 The Autumnal Equinox Is the 1 st day of autumn (fall) Is the 1 st day of autumn (fall) Equal hours of daylight and darkness Equal hours of daylight and darkness Happens around September 21 st (in the Northern Hemisphere) Happens around September 21 st (in the Northern Hemisphere)

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