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E A R T H ’ S O R B I T
R O B E R T S I M P S O N
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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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T O P V I E W
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T O P V I E W
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N
S
S I D E V I E W
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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
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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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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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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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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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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 )
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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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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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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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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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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)
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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
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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
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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
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4 1 , 0 0 0 Y E A R S
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4 1 , 0 0 0 Y E A R S
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4 1 , 0 0 0 Y E A R S
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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.
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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
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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
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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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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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