Group V The Seasons

There are four astronomical seasons; Winter Spring Summer Autumn.

Spring - March Equinox to June Solstice;
Summer - June Solstice to September Equinox
Autumn - September Equinox to December Solstice; and,
Winter - December Solstice to March Equino

Winter often lasts from December until February
Spring lasts from March to May
Summer lasts from June to August
Autumn lasts from September to November

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun).

Seasons areas old as earth itself, we tell time by them, plan our calendar around them and look forward to the changes they bring. Seasons are created by two very important events – the rotation of the Earth that gives us day and night, and the rotation of the Earth around the sun that gives us our year. Because the sun never changes, only the movement of the Earth creates changes in light and darkness, and in temperature.

The orbit of the Earth around the sun is elliptical (a squashed circle), and the planet does not sit straight up and down. It sits at a tilt. As the Earth moves in its path around our star, there are times a certain part of the planet is closer to the sun. If the axis (the imaginary straight line around which the Earth rotates to make day and night) is pointing toward the sun, that hemisphere can expect summer. If the axis is pointed away from the sun on the Earth’s yearly trip, that half of the planet will see winter.

Because of this, the Northern Hemisphere of the planet has summer while the Southern Hemisphere experiences winter. It seems as strange for kids in Australia to imagine a white Christmas as it is for kids in New York to think of splashing in the pool in December. That is how it works, though, when the two hemispheres of the Earth are opposite in seasons!

Because seasons are based on the rotation of the planet around the sun, the seasons change at the same time every year, even though the two halves of the planet experience opposite seasons!

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