As you know, a full year on Earth has four seasons: autumn, winter, spring, and summer. The existence of the seasons is due to the Earth's movements in its orbit around the Sun. Depending on latitude and altitude, the changes in weather and climate can be minimal or maximal. In other words, some seasons can be very distinct and different, while others are more similar.
Here we are going to explain everything you need to know about the seasons of the year in detail so that doubts are resolved.
Seasons of the year and their importance
In the mid-latitude regions of the planet, the climate changes considerably throughout the year. The seasons have more or less similar characteristics in all areas of this latitude. Changes in temperature, precipitation, winds, etc., affect the landscape, as they are also intertwined with the phenology of the living organisms that inhabit them.
The landscape is also affected in urban areas, as human activities change with the seasons. Coastal areas are very different in the height of summer than in winter. Activities, decorations, and the presence or absence of crowds on the beaches all alter the landscape.
Generally, we talk about four seasons, each lasting roughly three months. However, some areas of our planet only have two seasons: a wet season and a dry season. This occurs, for example, in monsoon regions. Monsoons are periods of heavy rainfall in tropical areas. They happen at a specific time of year and cause severe flooding. To better understand why the seasons occur , it's important to understand climate dynamics.
Causes and effects
We're going to learn what causes the seasons and what effects they have on life on Earth. Our axis is tilted about 23 degrees relative to the plane of its orbit around the Sun. This means that different areas of the Earth receive varying amounts of sunlight at different times of the year.
The variations in the climate that different parts of the planet have are more differentiated in cold and temperate zones and milder in the tropics. For example, the closer we get to the equator, the less variety there is in the climate throughout the year. This is because they almost always receive the same amount of sunlight, even though we are in different positions relative to the sun in orbit.
The seasons are usually differentiated by climatic seasons. These seasons last approximately three months and depend on the tilt of the Earth's axis. One might think that it's hotter in summer because our planet is closer to the Sun. However, this isn't the case. On the contrary, the Earth's distance from the Sun is greater in summer than in winter. This refers to the Northern Hemisphere. However, since the sun's rays are at a greater angle in winter, temperatures are lower.
There are four seasons: spring, summer, autumn, and winter. The first two are characterized by longer days than nights, while the latter two are shorter. Since climate variations are due to the tilt of the Earth's axis, they don't occur at the same rate in the Northern and Southern Hemispheres. The two hemispheres experience reversed effects. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. We can also observe that when spring begins in one hemisphere, autumn begins in the other.
Solstices and equinoxes
As the Earth rotates with its North Pole tilted toward the Sun, the South Pole tilts in the opposite direction. This causes northern regions to receive more solar radiation than southern regions . This process reverses, and areas of the Northern Hemisphere receive less heat as the days shorten and the sun's rays strike the Earth at a more oblique angle.
The astronomical seasons are determined by the four main positions of Earth's orbit around the sun. These positions, called aphelion and perihelion , give rise to the winter and summer solstices and the spring and autumn equinoxes.
When an equinox takes place, the sun's rays are striking perpendicularly on the earth's surface, so they fall vertically at the equator. On the other hand, when the solstices take place, the opposite happens. That is, the sun's rays are hitting the earth's surface at an inclination of 23,5 degrees. This makes the Tropic of Cancer summer and the Tropic of Capricorn winter.
Not all seasons last the same amount of time. This is because the Earth's orbit around the Sun is not circular, but elliptical. This causes eccentricity. The Earth moves faster when it is closer to the Sun and slower when it is farther away.
Relationship of the Earth's orbit with the stations
Each season is not the same in each hemisphere. The Earth is closest to the sun at the beginning of January, yet it is winter in the Northern Hemisphere. However, at the beginning of July, we are farthest from the sun, but it is summer in the Northern Hemisphere. Northern Hemisphere summers are less hot than Southern Hemisphere summers, and winters are milder.
The seasons of the year do not always begin on the same day and at the same time due to a series of disturbances that the Earth experiences as it revolves around the Sun. If you want to know exactly when each season begins, we have to inform ourselves of television or astronomical calendars .
I hope that with this information you can learn more about the seasons of the year, why they are formed and what their characteristics are.