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Reasons for the Seasons

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Kelsey Koranda

on 14 January 2013

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Transcript of Reasons for the Seasons

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli What are the four seasons? Reasons for the Seasons Are the different seasons
caused by the
change in the distance
between the Sun and the Earth? The tilt of the Earth Earth's tilt is 23.5 degrees, and it is what really causes the seasons. As the Earth makes a revolution or a complete turn around the sun, the different hemispheres get different amounts of sunlight which causes summer, fall, winter, and spring. Northern and Southern Hemispheres Northern and southern hemispheres are always opposite in seasons. If the northern hemisphere is in winter, the southern is in summer. If, southern is in fall, northern is in spring. Direct and Indirect Sunlight Solstices and Equinoxes Solstice: First day of summer and winter

Equinox: First day of spring and fall Let's Review! No. If it was, then...
- The northern and southern hemisphere should have the same season, not opposite season like we have.
- Some place like Hawaii would experience real seasonal changes too. So what is the actual reason for seasons? Solstice This usually happens around June 21st and December 21st.
On these solstices, the rays of the Sun shine directly on one of the two Tropics. During the June Solstice the rays of the Sun shine directly on the Tropic of Cancer.

Longest day of the year During the December Solstice the Sun’s rays shine on the Tropic of Capricorn.

Shortest day of the year Equinox During these equinoxes the rays of the Sun shine directly on the equator.
This happens on approximately March 20th and September 22nd.
Equal length of day and night.
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