why do the northern and southern hemispheres have opposite seasons

A is a period of the year that is distinguished by special conditions. The four seasonsвspring, fall, and
вfollow one another regularly. Each has its own light, and patterns that repeat yearly. In the, winter generally begins on December 21 or 22. This is the, the day of the year with the shortest period of daylight. Summer begins on June 20 or 21, the, which has the most daylight of any day in the year. Spring and fall, or autumn, begin on equinoxes, days that have equal amounts of daylight and darkness. The vernal, or spring, equinox falls on March 20 or 21, and the is on September 22 or 23. The seasons in the Northern Hemisphere are the opposite of those in the.

This means that in Argentina and Australia, winter begins in June. The winter solstice in the Southern Hemisphere is June 20 or 21, while the summer solstice, the longest day of the year, is December 21 or 22. Seasons occur because Earth is tilted on its relative to the orbital plane, the invisible, flat disc where most objects in the solar system orbit the. Earthвs axis is an invisible line that runs through its center, from to pole. Earth rotates around its axis. In June, when the Northern Hemisphere is tilted toward the sun, the sunвs rays hit it for a greater part of the day than in winter.

This means it gets more hours of daylight. In December, when the Northern Hemisphere is tilted away from the sun, with fewer hours of daylight. Seasons have an enormous influence on vegetation and plant growth. Winter typically has cold weather, little daylight, and limited plant growth. In spring, plants, tree leaves, and flowers. Summer is the warmest time of the year and has the most daylight, so plants grow quickly. In autumn, temperatures drop, and many trees lose their leaves. The four-season year is typical only in the mid-latitudes. The mid-latitudes are places that are neither near the poles nor near the. The farther north you go, the bigger the differences in the seasons.

Helsinki, Finland, sees 18. 5 hours of daylight in the middle of June. In mid-December, however, it is light for less than 6 hours. Athens, Greece, in southern Europe, has a smaller variation. It has 14. 5 hours of daylight in June and 9. 5 hours in December. Places near the Equator experience little. They have about the same amount of daylight and darkness throughout the year. These places remain warm year-round. Near the Equator, regions typically have alternating rainy and dry seasons. Polar regions experience seasonal variation, although they are generally colder than other places on Earth.

Near the poles, the amount of daylight changes dramatically between summer and winter. In Barrow, Alaska, the northernmost city in the U. S. , it stays light all day long between mid-May and early August. The city is in total darkness between mid-November and January. The seasons are determined by the amount of sunlight received and the angle of the sunlight. During the Northern summer, for example, the Northern hemisphere experiences its l ongest daytimes because the North Pole is pointed more or less towards the sun. Above the Arctic Circle, the time between sun-rise and sun-set can actually be measured in days rather than hours.

At the same time, the South Pole is pointed more or less away from the sun and the Southern Hemisphere experiences its shortest days - and consequently Winter. Below the Antarctic Circle, the sun does not rise at all setting near the beginning of Winter and rising again at the start of Spring. Granted, this oversimplifies a bit - the closer you go to the South Pole, the longer it is between sunset and sunrise, while right at the Antarctic Circle the sun may not rise at all for only about 48 hours. The situation is reversed during the Northern Winter when the North Pole points away from the sun and the South Pole points towards the sun.

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