Reasons for the Seasons

In Glogpedia

by td2422
Last updated 5 years ago

Discipline:
Science
Subject:
Weather and Climate

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Reasons for the Seasons

Reasons for the Seasons

SpringThis season begins around March 20 or 21 in the Northern Hemisphere when the vernal equinox occurs and around September 22 or 23 in the Southern Hemisphere when the autumnal equinox occurs.

SummerThis season begins when the summer solstice occurs on June 20 or 21 in the Northern Hemisphere and December 21 or 22 in the Southern Hemisphere. This day is the longest of the year.

AutumnThis season begins around March 20 or 21 in the Southern Hemisphere when the vernal equinox occurs and around September 22 or 23 in the Northern Hemisphere when the autumnal equinox occurs.

WinterThis season begins when the winter solstice occurs on December 21 or 22 in the Northern Hemisphere and June 20 or 21 in the Southern Hemisphere. This day is the shortest of the year.

Axis TiltThe Earth's axis is tilted at 23.5 degrees. This causes the seasons. When the Earth's axis points towards the Sun, it is summer for that hemisphere. When the Earth's axis points away, winter can be expected. The North Pole never points exactly at the Sun. On the summer solstice it is as close as it can get to exact sunlight and on the winter solstice it is as far away as it can get.

Revolution Around the SunThe revolution of the Earth around the Sun causes the seasons. If the Earth did not revolve around the Sun there would be no seasons because the Sun's energy would stay in the same place on the Earth causing it to be the same temperature all of the time. When the Earth is revolving around the Sun it causes the angle of the sunlight to change. This causes the temperature to change which causes the seasons to change.

Angle of SunlightThere is indirect and direct sunlight. These cause the seasons. Direct sunlight is when less sunlight is scattered before reaching the ground because there is less distance to travel through the atmosphere. Indirect sunlight is when a large amount of sunlight is scattered before reaching the ground because there is more distance to travel through the atmosphere. This causes changes in temperature which changes the seasons.

Equinoxes and SolsticesEquinoxes and Solstices are the beginning of the seasons. Solstices are days when the Sun is at its fartest from the celestial equator. During the solstices the Sun is either directly over the Tropic of Cancer or the Tropic of Capricorn. Equinoxes are days when the Sun is crossing the celestial equator and day and night are of the same length. During the equinoxes the Sun is directly over the equator.


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