The science behind the seasons

The science behind the seasons

The North and South Pole only have one sunrise and one sunset a year. When we face away it is night. During part of the year, Earth is closer to the sun than at other times. The two days are called equinoxes equal nights , and they fall in the middle of spring and autumn, usually on September 22 and March The south's summer solstice happens around December 21, the winter solstice for the north. Another factor that may come into play is that the radiation takes a somewhat shorter path through the energy-absorbing atmosphere before striking Earth. That is why we have day and night, and why every part of Earth's surface gets some of each. Thanksgiving is a good example. Additional resources. Each season brings with it its own potential dangers, but also its own particular brand of beauty. And, believe it or not, aphelion—when Earth is farthest from the Sun—occurs in July, and perihelion—when we are closest—occurs in January. Why do seasons occur? Saturday is thus the longest day of the year for the Northern Hemisphere's residents, and the longest night of the year south of the equator. Some animals, like bears, hibernate in the winter while other animals, like birds, migrate to warmer climates.

It is summer in June in the Northern Hemisphere because the sun's rays hit that part of Earth more directly than at any other time of the year. But not all countries have seasons.

why do we have seasons

The astronomical definition of the seasons relates to specific points in Earth's trip around the sun. It takes days, or an entire year, for the Earth to make a full trip around the Sun.

seasons explained

Earth has four seasons throughout the year: winter, spring, summer, and autumn. This corresponds to the Fall and Spring Equinox equinox is Latin for "equal night". But what caused Earth to tilt?

What causes seasons

The same is true on the earth. What problems would there be if you had to live somewhere that was dark for six months of the year and light for six months of the year? This is why when we have winter, Australia has summer. The two days are called equinoxes equal nights , and they fall in the middle of spring and autumn, usually on September 22 and March Can you see which the pole star is? When the earth's axis points towards the sun, it is summer for that hemisphere. The sequence illustrates how Earth's northern half receives more sunlight in June, while the southern half gets more light in December. It is winter in December in the Northern Hemisphere, because that is when it is the South Pole's turn to be tilted toward the sun. In autumn the leaves change colors and fall off the trees and school starts again. It is summer in June in the Northern Hemisphere because the sun's rays hit that part of Earth more directly than at any other time of the year. These storms are thus much more frequent and intense in the winter than in the summer.

Regions near the equator experience fairly constant temperatures throughout the year, with balmy winters barely discernible from warm summers. In summer the sunlight shines more directly on the earth giving more energy to the Earth's surface and heating it up.

Earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom.

Seasons for kids

During these times of the year, the hemispheres experience spring and autumn. But what caused Earth to tilt? Equinoxes are another significant day during Earth's excursion around the sun. The strong temperature contrast between the cold air masses over land and the relatively warmer air masses over the ocean lead to extratropical non-tropical cyclone formation low pressure. Despite this fact, the global-average surface temperature is warmer in Northern Hemisphere summer, due to the much greater expanse of land there, and since land heats to a higher temperature than the ocean does. In late December, on the date of the "winter solstice", the Earth's tilt away from the sun is maximized, leading to a minimum of sunlight reaching the Northern Hemisphere. The astronomical definition of the seasons relates to specific points in Earth's trip around the sun.

Tropics and poles Some parts of the polar regions are so consistently cold — and the tropics so hot — they could pass for having only one season. The tilt has two major effects: the angle of the Sun to the earth and length of the days.

What causes the seasons to change

Earth Science Subjects. The density of light drops. This is what causes the seasons. The south's summer solstice happens around December 21, the winter solstice for the north. In both hemispheres, the summer solstice marks the first day of astronomical summer, while the winter solstice is considered the first day of astronomical winter. At different times during the year, the northern or southern axis is closer to the sun. Summer happens when the Northern hemisphere, or the part of planet we are on in Southern California, is tilted toward the Sun. Each season brings different changes to the Earth, impacting how we go about our day. Regions near the equator experience fairly constant temperatures throughout the year, with balmy winters barely discernible from warm summers. Often crops are harvested at the end of the summer. Equinoxes are another significant day during Earth's journey around the Sun. In the spring, animals are born and plants come back to life. Do you sometimes wish it could be summer all year round? When we are facing the Sun it is day.
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The Four Seasons