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half of the earth


the north star


occurs twice a year

winter solstice

has the shortest number of daylight hours

summer solstice

has the longest number of daylight hours

two north's

geographic and magnetic

Tropic of Cancer

23 1/2 degrees North latitude

Tropic of Capricorn

23 1/2 degrees South latitude


zero degrees latitude

tilt of the earth

causes the seasons

How many degrees in the earth's tilt?

23 1/2 degrees

How often does an equinox happen?

twice a year

When it is summer in the northern hemisphere, what is is in the southern?


What happens during an equinox?

12 hours of day and 12 hours of night

Does the earth wobble?

Yes it wobbles on its axis

vernal equinox

spring, March 21

autumnal equinox

fall, September 21

What is magnetic north?

where the compass points

What is geographic north?

where the earth axis points

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