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4 seasons #2 HTML5


The seasons are three-month periods separating the equinoxes (spring, autumn) and the solstices (summer, winter).

The changing seasons are linked to the variation of the Earth's axial tilt comparative to the plane of the ecliptic.
The Earth’s rotation axis is tilted at an angle of 23.5° from the perpendicular in its year-long orbit around the sun. As the tilt is fixed in space, each of the Earth’s poles is alternately exposed more to the sun every six months.

Diagrams are not drawn to scale.

Click on a date to locate the Earth at this time.

Learning goals

  • To understand the meaning of the tropics.
  • To link the alternating seasons to the Earth's axial tilt .
  • To understand how the duration of  daylight  changes with  the seasons.

Learn more

During the solstices, the hemisphere tilted towards the sun, where it is summer, receives more solar energy than the one tilted away from it, where it is winter. During the equinoxes, both…

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