The Earth's Orbit

Transcript

1. E A R T H ’ S O R B

   I T R O B E R T S I M P S O N

2. O N T H E M O V E •

   100,000 kph (62,000 mph) • 365.24219 days • 940 million km (584 million miles)
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4. T O P V I E W

5. T O P V I E W

6. N S S I D E V I E W

7. S S S S N N N N W I

   N T E R S U M M E R S P R I N G A U T U M N S E A S O N S

8. S S S S N N N N S O

   L S T I C E S O L S I T I C E E Q U I N O X E Q U I N O X
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12. I M A G E : W I K I

    M E D I A C O M M O N S ( TA U ʻ O L U N G A )
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14. I M A G E : W I K I

    M E D I A C O M M O N S ( TA U ʻ O L U N G A )
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16. I M A G E : W I K I

    M E D I A C O M M O N S ( TA U ʻ O L U N G A )
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18. I M A G E : W I K I

    M E D I A C O M M O N S ( YA N Z H A N G )

19. T H E E A R T H S P

    I N S R O L L I N G , R O L L I N G , R O L L I N G

20. T H E E A R T H S P

    I N S R O L L I N G , R O L L I N G , R O L L I N G
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32. G O R E Y H A R B O

    U R , J E R S E Y; W I K I M E D I A C O M M O N S ( F O X Y O R A N G E )
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48. C H E LYA B I N S K M

    E T E O R F E B R U A RY 2 0 1 3
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55. M I L A N K O V I T

    C H C Y C L E S • Cycle in perihelion (precession of our orbit)

56. W I N T E R S U M M

    E R S P R I N G A U T U M N 2 3 , 0 0 0 Y E A R S

57. W I N T E R S U M M

    E R S P R I N G A U T U M N 2 3 , 0 0 0 Y E A R S

58. M I L A N K O V I T

    C H C Y C L E S • Cycle in perihelion (precession of our orbit) • Axial precession about our axis; like a wobbling spinning-top

59. 4 1 , 0 0 0 Y E A R

    S

60. 4 1 , 0 0 0 Y E A R

    S

61. 4 1 , 0 0 0 Y E A R

    S

62. M I L A N K O V I T

    C H C Y C L E S • Cycle in perihelion (precession of our orbit) • Axial precession about our axis; like a wobbling spinning-top • Shape of our orbit becomes more and less elliptical.

63. W I N T E R S U M M

    E R S P R I N G A U T U M N 1 0 0 , 0 0 0 Y E A R S

64. W I N T E R S U M M

    E R S P R I N G A U T U M N 1 0 0 , 0 0 0 Y E A R S

65. M I L A N K O V I T

    C H C Y C L E S • Cycle in perihelion (precession of our orbit) • Axial precession about our axis; like a wobbling spinning-top • Shape of our orbit becomes more and less elliptical. ! • We are half way through these cycles
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67. S U M M A RY • Earth is tilted

    as it spins, this creates our seasons • The Earth’s spin creates huge speed differentials, and the Coriolis effect • The Earth’s spin, and the gravity of the Moon and Sun contribute to tides • Our orbit takes us into the path of other orbiting bodies • Periodic changes in our spin, tilt and orbit affect the global temperature
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