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The Sun & the ecliptic rotation around the Earth : The green Sun is the one of the vernal equinox (march), it is followed by a summer solstice Sun. Then automn equinox and winter solstice. The ground plane (latitude 50°N) is green, the rotating ecliptic plane is blue. Also represented are the celestial equator, the two tropics and the rotation axis.  Animation on Wikimedia Commons by Xofc
The Sun & the ecliptic rotation around the Earth : The green Sun is the one of the vernal equinox (march), it is followed by a summer solstice Sun. Then automn equinox and winter solstice. The ground plane (latitude 50°N) is green, the rotating ecliptic plane is blue. Also represented are the celestial equator, the two tropics and the rotation axis. Animation on Wikimedia Commons by Xofc

1.6 Give reasons for noting the days that mark the change in seasons.


Summer Solstice
  • The first day of summer
  • Longest day of the year
  • This happens when the North Pole is pointing towards the sun
  • Because the North Pole is pointing towards the sun, the Northern Hemisphere is warmed by direct sunlight
  • During summer, the days are long and hot

Winter Solstice
  • The first day of winter
  • Shortest day of the year
  • This happens with the North Pole is pointing away from the sun
  • Because the North Pole is away from the sun, the Northern Hemisphere does not receive direct sunlight
  • During winter, the days are short and cold


Vernal Equinox
  • The first day of spring
  • Equal parts day and night
  • On this day, the North Pole begins leaning towards the sun

Autumnal Equinox
  • The first day of fall
  • Equal parts day and night
  • On this day, the North Pole begins leaning away from the sun


For more information, see The Changing Seasons: A Brief Tutorial.

4seasons.giffour.JPG
Orbital_relations_of_the_Solstice,_Equinox_&_Intervening_Seasons.svg.png
Orbital Position of Earth During Changing Seasons





lessonplan.jpgClick here for a lesson plan about the seasons.
lessonplan.jpgClick here for a lesson plan about the seasons.

Multimedia.pngClick here for a youtube video on the changing seasons.
Multimedia.pngClick here for a song about the seasons.