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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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S O M E N O T E S
B U T F I R S T
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S O M E G O O D N E W S
• Wine with dinner tonight thanks to Hurtigruten
• Walking tours in Hammerfest and Tromsø thanks to Karin
• but… on Sunday we need to have dinner at 4pm not 7:30pm
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A U R O R A S A FA R I - S U N D AY N I G H T
• Pick up at 6:15pm on Sunday evening from Radisson Blu
• ACE have arranged for us to have ur own coach and guide
• Basecamps with wood fires, hot drinks, snacks
• Tripods, advice on cameras
• Only restriction is a 100-200m walk from coach to base
camp
• Dress up warm, but with layers (warm at basecamp)
84%
success rate
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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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S I M P L E M O D E L
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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 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 4 1 , 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 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
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2 3 , 0 0 0 Y E A R S
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2 3 , 0 0 0 Y E A R S
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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
• 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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H T T P : / / W W W. G I . A L A S K A . E D U / A U R O R A F O R E C A S T / E U R O P E /
“Auroral activity will be moderate. Weather permitting, moderate
displays will be visible overhead in Tromsø, Norway and Reykjavik,
Iceland…”
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TA C T I C S
• After dinner, go get ready to go outside.
• Take your things to the bar or cafe.
• Go and check once in a while to see if whether is clear. (I will do this too)
• If it is, stay outside for a bit. Give it time.
• Tell someone if you can see them. Share the news!
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TA C T I C S
• Get away from ships lights, become
dark adapted.
• Don’t give up.
• Come inside when your cold, and go
back out in a bit.
• Have a nap now if it will help.