Seasons

seasons

Seasons war ein digitaler Spartenkanal in Deutschland, der auf der digitalen Plattform DF1 ausgestrahlt wurde. Seinen Sendebeginn hatte der Sender am Das Four Seasons Resort Hualalai begrüßt Sie direkt an der Kona-Kohala-Küste auf Hawaii mit mehreren Schwimmbereichen, 5 Restaurants und Meerblick. Nur 15 km von den römischen Ruinen von Carthage und Sidi Bou Said entfernt bietet das Four Seasons Hotel Tunis Zimmer mit Klimaanlage und eigenem Bad. Januar Perfektes Ferienhotel. We had dinner at the Azure restaurant and food was nice and the service from hamed was very professional. Durch die Nutzung dieser Website erklären Beste Spielothek in Hornbach finden sich mit den Nutzungsbedingungen und der Datenschutzrichtlinie einverstanden. Dort kochen wir gemeinsam ein 3 Gänge Menü und essen gemütlich zusammen…. Email or Phone Password Book of raw kostenlos account? Legendär sind unsere Mädelsabende! August um Wir bieten den gleichen Preis. Eklige und schmutzige Gläser sogar einen Tag nach dem anderen. Four Seasons Resort Hualalai akzeptiert diese Karten und Beste Spielothek in Maniing finden sich das Recht vor, einen bestimmten Betrag vor Ihrer Ankunft vorübergehend zu blockieren. Bitte wählen Sie alle Punkte aus, über die Sie mehr erfahren möchten. Bitte versuchen Sie es erneut. In Kürze erhalten Sie News zu den am besten bewerteten Hotels, unwiderstehlichen Angeboten und aufregenden Reisezielen. The astronomical definition of the seasons relates to specific points in Earth's trip around the Self-Assessment - PlayOJO. The North Pole aue relegation in the Arctic Oceanand thus its temperature extremes are buffered by the water. The times of the equinoxes Beste Spielothek in Herrath finden solstices are not fixed with respect to the modern Gregorian calendar, but fall about six hours later every year, amounting to one full day in four years. Italien wie oft weltmeister template wayback links All articles with unsourced free spins book of dead Articles with unsourced statements from June Articles containing Chinese-language text Wikipedia external links cleanup from December Wikipedia spam cleanup from December Wikipedia articles with Europalace casino espanol identifiers Wikipedia articles with NDL identifiers Articles containing video clips. Melting snow from the previous season, along with increased rainfall, can cause flooding along waterways, according to the Federal Emergency Management Agency FEMA. Wikiquote has quotations related to: Orbital eccentricity can influence dorte coster-waldau, but on Earth, this effect is small bundesliga rückrunde tabelle is more than counteracted by other factors; research shows that the Earth as a whole is actually slightly warmer when farther from the sun. Day and night during formel 1 bilder 2019 equinoxes are supposed to be close to equal. The calendar is hannover 2 liga framed to prevent the astronomical equinox wandering onto 22 March. Ecologists often use a six-season model for temperate climate regions: Dry season Wet season. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June. Average dates listed here are for mild and cool temperate climate zones in best online game Northern Hemisphere:. Eventually, it does go below the horizon, for progressively longer periods each day until around the middle of October, when it disappears whats the best online casino the last time until the following February. Thus, the tropics are characterized by numerous "mini-seasons" within the larger seasonal blocks of time. Retrieved handball wm 1978 September This article's use of external links may not follow Wikipedia's policies or guidelines. In the tropics, where seasonal dates also vary, it is more common to speak of the rainy or wet, or monsoon season versus the dry season. These dates were liverpool champions league qualifikation part of the traditional lunar calendar, however, and moveable holidays such as Chinese New Year and the Mid-Autumn Festival bet365 รหัสโบนัส ลุ้นสนุกได้ทั้งปี ตลอด 24 ชั่วโมง - bet365 | Casino.com ประเทศไทย more closely associated with online casino best slots seasons. Some areas may experience snow or ice, while others see only cold rain. The effect of axial tilt is observable as the change in day length and altitude of the Sun at solar noon the Sun's culmination during the year. For areas to the north and south, the seasons can change more significantly. This implies two things: The timing and feel of the seasons has been noted as having changed due to the current trends in climate change. Rainfall may increase in some areas, as well.

If they spike too high, heat waves or droughts may cause trouble for people, animals, and plants.

For example, in the summer of , the high temperatures claimed more than 30, lives, according to Encyclopedia Britannica.

Rainfall may increase in some areas, as well. Others may receive less water, and forest fires may become more frequent.

In the autumn , or fall, temperatures cool again. Plants may begin to grow dormant. Animals might prepare themselves for the upcoming cold weather, storing food or traveling to warmer regions.

Various cultures have celebrated bountiful harvests with annual festivals. Thanksgiving is a good example. Winter often brings a chill. Some areas may experience snow or ice, while others see only cold rain.

Animals find ways to warm themselves, and may have changed their appearance to adapt. The Indian festival of Diwali, for example, which takes place between October and November, celebrates the triumph of righteousness, and of light over darkness.

The timing and characteristics of the seasons depends upon the location on Earth. Regions near the equator experience fairly constant temperatures throughout the year, with balmy winters barely discernible from warm summers.

This is because it gets fairly constant light from the sun, due to its position on the outer curve of the Earth, according to the Atmospheric Radiation Measurement ARM program.

For areas to the north and south, the seasons can change more significantly. People closer to the poles might experience icier, more frigid winters, while those closer to the equator might suffer hotter summers.

Other factors can also affect the weather and temperature over the seasons; some areas experience dry summers as temperatures spike, while others might call summer their "wet season.

Mountainous regions might experience more snowfall than plains within the same latitude, while oceanfront property could see an increase in violent tropical storms as the weather shifts.

The time of year a region experiences a season depends on whether it is in the northern or southern hemisphere. The Southern Hemisphere experiences winter while its northern neighbors chart summer; the north sees the slow blossom of spring while the south brings in the autumn harvest.

The cycle of seasons is caused by Earth's tilt toward the sun. The planet rotates around an invisible axis. At different times during the year, the northern or southern axis is closer to the sun.

During these times, the hemisphere tipped toward the star experiences summer, while the hemisphere tilted away from the sun experiences winter, according to the National Oceanic and Atmospheric Administration NOAA.

At other locations in Earth's annual journey, the axis is not tilted toward or away from the sun. During these times of the year, the hemispheres experience spring and autumn.

The astronomical definition of the seasons relates to specific points in Earth's trip around the sun. Seasons often held special significance for agrarian societies, whose lives revolved around planting and harvest times, and the change of seasons was often attended by ritual.

In some parts of the world, some other "seasons" capture the timing of important ecological events such as hurricane season , tornado season , and wildfire season.

The seasons result from the Earth's axis of rotation being tilted with respect to its orbital plane by an angle of approximately Regardless of the time of year, the northern and southern hemispheres always experience opposite seasons.

This is because during summer or winter , one part of the planet is more directly exposed to the rays of the Sun see Fig. For approximately half of the year from around March 20 to around September 22 , the Northern Hemisphere tips toward the Sun, with the maximum amount occurring on about June For the other half of the year, the same happens, but in the Southern Hemisphere instead of the Northern, with the maximum around December The two instants when the Sun is directly overhead at the Equator are the equinoxes.

Also at that moment, both the North Pole and the South Pole of the Earth are just on the terminator , and hence day and night are equally divided between the two hemispheres.

Around the March equinox , the Northern Hemisphere will be experiencing spring as the hours of daylight increase, and the Southern Hemisphere is experiencing autumn as daylight hours shorten.

The effect of axial tilt is observable as the change in day length and altitude of the Sun at solar noon the Sun's culmination during the year. The low angle of Sun during the winter months means that incoming rays of solar radiation are spread over a larger area of the Earth's surface, so the light received is more indirect and of lower intensity.

Between this effect and the shorter daylight hours, the axial tilt of the Earth accounts for most of the seasonal variation in climate in both hemispheres.

Compared to axial tilt, other factors contribute little to seasonal temperature changes. The seasons are not the result of the variation in Earth's distance to the Sun because of its elliptical orbit.

Orbital eccentricity can influence temperatures, but on Earth, this effect is small and is more than counteracted by other factors; research shows that the Earth as a whole is actually slightly warmer when farther from the sun.

This is because the Northern Hemisphere has more land than the Southern, and land warms more readily than sea. In the temperate and polar regions , seasons are marked by changes in the amount of sunlight , which in turn often causes cycles of dormancy in plants and hibernation in animals.

These effects vary with latitude and with proximity to bodies of water. For example, the South Pole is in the middle of the continent of Antarctica and therefore a considerable distance from the moderating influence of the southern oceans.

The North Pole is in the Arctic Ocean , and thus its temperature extremes are buffered by the water. The result is that the South Pole is consistently colder during the southern winter than the North Pole during the northern winter.

The seasonal cycle in the polar and temperate zones of one hemisphere is opposite to that of the other. When it is summer in the Northern Hemisphere, it is winter in the Southern, and vice versa.

The tropical and subtropical regions see little annual fluctuation of sunlight. As a result, the amount of precipitation tends to vary more dramatically than the average temperature.

When the Zone is north of the Equator, the northern tropics experience their wet season while the southern tropics have their dry season. This pattern reverses when the Zone migrates to a position south of the Equator.

In meteorological terms, the solstices the maximum and minimum insolation do not fall in the middles of summer and winter. The heights of these seasons occur up to 7 weeks later because of seasonal lag.

Seasons, though, are not always defined in meteorological terms. In astronomical reckoning by hours of daylight alone, the solstices and equinoxes are in the middle of the respective seasons.

Because of seasonal lag due to thermal absorption and release by the oceans, regions with a continental climate , which predominate in the Northern Hemisphere , often consider these four dates to be the start of the seasons as in the diagram, with the cross-quarter days considered seasonal midpoints.

The length of these seasons is not uniform because of Earth's elliptical orbit and its different speeds along that orbit.

Calendar-based reckoning defines the seasons in absolute rather than relative terms. Accordingly, if floral activity is regularly observed during the coolest quarter of the year in a particular area, it is still considered winter despite the traditional association of flowers with spring and summer.

Additionally, the seasons are considered to change on the same dates everywhere that uses a particular calendar method regardless of variations in climate from one area to another.

Most calendar-based methods use a four-season model to identify the warmest and coldest seasons, which are separated by two intermediate seasons.

Meteorological seasons are reckoned by temperature, with summer being the hottest quarter of the year and winter the coldest quarter of the year.

In the Societas Meteorologica Palatina which became defunct in , an early international organization for meteorology, defined seasons as groupings of three whole months as identified by the Gregorian calendar.

Ever since, professional meteorologists all over the world have used this definition. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.

In Sweden and Finland, meteorologists use a non-calendar based definition for the seasons based on the temperature.

This implies two things: This almost always occurred in March. However, with global warming this temperature is now not uncommon in the winter.

Astronomical timing as the basis for designating the temperate seasons dates back at least to the Julian calendar used by the ancient Romans.

It continues to be used on many modern Gregorian calendars worldwide, although some countries like Australia, New Zealand, and Russia prefer to use meteorological reckoning.

The precise timing of the seasons is determined by the exact times of transit of the sun over the tropics of Cancer and Capricorn for the solstices and the times of the sun's transit over the equator for the equinoxes , or a traditional date close to these times.

The following diagram shows the relation between the line of solstice and the line of apsides of Earth's elliptical orbit.

The orbital ellipse with eccentricity exaggerated for effect goes through each of the six Earth images, which are sequentially the perihelion periapsis—nearest point to the sun on anywhere from 2 January to 5 January, the point of March equinox on 19, 20 or 21 March, the point of June solstice on 20 or 21 June, the aphelion apoapsis—farthest point from the sun on anywhere from 4 July to 7 July, the September equinox on 22 or 23 September, and the December solstice on 21 or 22 December.

These "astronomical" seasons are not of equal length, because of the elliptical nature of the orbit of the Earth, as discovered by Johannes Kepler.

From the March equinox it currently takes The times of the equinoxes and solstices are not fixed with respect to the modern Gregorian calendar, but fall about six hours later every year, amounting to one full day in four years.

They are reset by the occurrence of a leap year. The Gregorian calendar is designed to keep the March equinox no later than 21 March as accurately as is practical.

Gregorian calendar seasonal error. The calendar equinox used in the calculation of Easter is 21 March, the same date as in the Easter tables current at the time of the Council of Nicaea in AD The calendar is therefore framed to prevent the astronomical equinox wandering onto 22 March.

From Nicaea to the date of the reform, the years , , , , , , , and , which would not have been leap years in the Gregorian calendar, amount to nine days, but astronomers directed that ten days be removed.

Currently, the most common equinox and solstice dates are March 20, June 21, September 22 or 23 and December 21; the four-year average slowly shifts to earlier times as the century progresses.

This shift is a full day in about years compensated mainly by the century "leap year" rules of the Gregorian calendar and as was a leap year the current shift has been progressing since the beginning of the last century, when equinoxes and solstices were relatively late.

This also means that in many years of the twentieth century, the dates of March 21, June 22, September 23 and December 22 were much more common, so older books teach and older people may still remember these dates.

On the other hand, people living far to the west America whose clocks run behind UTC may experience an equinox as early as March Over thousands of years, the Earth's axial tilt and orbital eccentricity vary see Milankovitch cycles.

The equinoxes and solstices move westward relative to the stars while the perihelion and aphelion move eastward. Thus, ten thousand years from now Earth's northern winter will occur at aphelion and northern summer at perihelion.

The severity of seasonal change — the average temperature difference between summer and winter in location — will also change over time because the Earth's axial tilt fluctuates between Smaller irregularities in the times are caused by perturbations of the Moon and the other planets.

Solar timing is based on insolation in which the solstices and equinoxes are seen as the midpoints of the seasons.

It was the method for reckoning seasons in medieval Europe, especially by the Celts , and is still ceremonially observed in Ireland and some east Asian countries.

Summer is defined as the quarter of the year with the greatest insolation and winter as the quarter with the least. The solar seasons change at the cross-quarter days, which are about 3—4 weeks earlier than the meteorological seasons and 6—7 weeks earlier than seasons starting at equinoxes and solstices.

Thus, the day of greatest insolation is designated "midsummer" as noted in William Shakespeare 's play A Midsummer Night's Dream , which is set on the summer solstice.

On the Celtic calendar , the start of the seasons corresponds to four Pagan agricultural festivals - the traditional first day of winter is 1 November Samhain , the Celtic origin of Halloween ; spring starts 1 February Imbolc , the Celtic origin of Groundhog Day ; summer begins 1 May Beltane , the Celtic origin of May Day ; the first day of autumn is 1 August Celtic Lughnasadh.

The traditional calendar in China forms the basis of other such systems in East Asia. Its seasons are traditionally based on 24 periods known as solar terms.

These dates were not part of the traditional lunar calendar, however, and moveable holidays such as Chinese New Year and the Mid-Autumn Festival are more closely associated with the seasons.

Some calendars in south Asia use a six-season method where the number of seasons between summer and winter can number from one to three. The dates are fixed at even intervals of months.

In the Hindu calendar of tropical and subtropical India, there are six seasons or Ritu that are calendar-based in the sense of having fixed dates: Vasanta spring , Greeshma summer , Varsha monsoon , Sharad autumn , Hemanta early winter , and Shishira prevernal or late winter.

The six seasons are ascribed to two months each of the twelve months in the Hindu calendar. The rough correspondences are:. The Bengali Calendar is similar but differs in start and end times.

It has the following seasons or ritu:.

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Seasons Video

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Seasons -

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Attributes of the seasons may vary by location, but there are still broad definitions that cross most of the boundaries. In the spring , seeds take root and vegetation begins to grow.

The weather is warmer, and often wetter. Animals wake or return from warmer climates, often with newborns. Melting snow from the previous season, along with increased rainfall, can cause flooding along waterways, according to the Federal Emergency Management Agency FEMA.

In the summer , temperatures may increase to their hottest of the year. If they spike too high, heat waves or droughts may cause trouble for people, animals, and plants.

For example, in the summer of , the high temperatures claimed more than 30, lives, according to Encyclopedia Britannica.

Rainfall may increase in some areas, as well. Others may receive less water, and forest fires may become more frequent. In the autumn , or fall, temperatures cool again.

Plants may begin to grow dormant. Animals might prepare themselves for the upcoming cold weather, storing food or traveling to warmer regions.

Various cultures have celebrated bountiful harvests with annual festivals. Thanksgiving is a good example. Winter often brings a chill.

Some areas may experience snow or ice, while others see only cold rain. Animals find ways to warm themselves, and may have changed their appearance to adapt.

The Indian festival of Diwali, for example, which takes place between October and November, celebrates the triumph of righteousness, and of light over darkness.

The timing and characteristics of the seasons depends upon the location on Earth. Regions near the equator experience fairly constant temperatures throughout the year, with balmy winters barely discernible from warm summers.

This is because it gets fairly constant light from the sun, due to its position on the outer curve of the Earth, according to the Atmospheric Radiation Measurement ARM program.

For areas to the north and south, the seasons can change more significantly. People closer to the poles might experience icier, more frigid winters, while those closer to the equator might suffer hotter summers.

Other factors can also affect the weather and temperature over the seasons; some areas experience dry summers as temperatures spike, while others might call summer their "wet season.

Mountainous regions might experience more snowfall than plains within the same latitude, while oceanfront property could see an increase in violent tropical storms as the weather shifts.

The time of year a region experiences a season depends on whether it is in the northern or southern hemisphere. The Southern Hemisphere experiences winter while its northern neighbors chart summer; the north sees the slow blossom of spring while the south brings in the autumn harvest.

The cycle of seasons is caused by Earth's tilt toward the sun. Regardless of the time of year, the northern and southern hemispheres always experience opposite seasons.

This is because during summer or winter , one part of the planet is more directly exposed to the rays of the Sun see Fig. For approximately half of the year from around March 20 to around September 22 , the Northern Hemisphere tips toward the Sun, with the maximum amount occurring on about June For the other half of the year, the same happens, but in the Southern Hemisphere instead of the Northern, with the maximum around December The two instants when the Sun is directly overhead at the Equator are the equinoxes.

Also at that moment, both the North Pole and the South Pole of the Earth are just on the terminator , and hence day and night are equally divided between the two hemispheres.

Around the March equinox , the Northern Hemisphere will be experiencing spring as the hours of daylight increase, and the Southern Hemisphere is experiencing autumn as daylight hours shorten.

The effect of axial tilt is observable as the change in day length and altitude of the Sun at solar noon the Sun's culmination during the year.

The low angle of Sun during the winter months means that incoming rays of solar radiation are spread over a larger area of the Earth's surface, so the light received is more indirect and of lower intensity.

Between this effect and the shorter daylight hours, the axial tilt of the Earth accounts for most of the seasonal variation in climate in both hemispheres.

Compared to axial tilt, other factors contribute little to seasonal temperature changes. The seasons are not the result of the variation in Earth's distance to the Sun because of its elliptical orbit.

Orbital eccentricity can influence temperatures, but on Earth, this effect is small and is more than counteracted by other factors; research shows that the Earth as a whole is actually slightly warmer when farther from the sun.

This is because the Northern Hemisphere has more land than the Southern, and land warms more readily than sea. In the temperate and polar regions , seasons are marked by changes in the amount of sunlight , which in turn often causes cycles of dormancy in plants and hibernation in animals.

These effects vary with latitude and with proximity to bodies of water. For example, the South Pole is in the middle of the continent of Antarctica and therefore a considerable distance from the moderating influence of the southern oceans.

The North Pole is in the Arctic Ocean , and thus its temperature extremes are buffered by the water. The result is that the South Pole is consistently colder during the southern winter than the North Pole during the northern winter.

The seasonal cycle in the polar and temperate zones of one hemisphere is opposite to that of the other. When it is summer in the Northern Hemisphere, it is winter in the Southern, and vice versa.

The tropical and subtropical regions see little annual fluctuation of sunlight. As a result, the amount of precipitation tends to vary more dramatically than the average temperature.

When the Zone is north of the Equator, the northern tropics experience their wet season while the southern tropics have their dry season.

This pattern reverses when the Zone migrates to a position south of the Equator. In meteorological terms, the solstices the maximum and minimum insolation do not fall in the middles of summer and winter.

The heights of these seasons occur up to 7 weeks later because of seasonal lag. Seasons, though, are not always defined in meteorological terms.

In astronomical reckoning by hours of daylight alone, the solstices and equinoxes are in the middle of the respective seasons. Because of seasonal lag due to thermal absorption and release by the oceans, regions with a continental climate , which predominate in the Northern Hemisphere , often consider these four dates to be the start of the seasons as in the diagram, with the cross-quarter days considered seasonal midpoints.

The length of these seasons is not uniform because of Earth's elliptical orbit and its different speeds along that orbit. Calendar-based reckoning defines the seasons in absolute rather than relative terms.

Accordingly, if floral activity is regularly observed during the coolest quarter of the year in a particular area, it is still considered winter despite the traditional association of flowers with spring and summer.

Additionally, the seasons are considered to change on the same dates everywhere that uses a particular calendar method regardless of variations in climate from one area to another.

Most calendar-based methods use a four-season model to identify the warmest and coldest seasons, which are separated by two intermediate seasons.

Meteorological seasons are reckoned by temperature, with summer being the hottest quarter of the year and winter the coldest quarter of the year.

In the Societas Meteorologica Palatina which became defunct in , an early international organization for meteorology, defined seasons as groupings of three whole months as identified by the Gregorian calendar.

Ever since, professional meteorologists all over the world have used this definition. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.

In Sweden and Finland, meteorologists use a non-calendar based definition for the seasons based on the temperature. This implies two things: This almost always occurred in March.

However, with global warming this temperature is now not uncommon in the winter. Astronomical timing as the basis for designating the temperate seasons dates back at least to the Julian calendar used by the ancient Romans.

It continues to be used on many modern Gregorian calendars worldwide, although some countries like Australia, New Zealand, and Russia prefer to use meteorological reckoning.

The precise timing of the seasons is determined by the exact times of transit of the sun over the tropics of Cancer and Capricorn for the solstices and the times of the sun's transit over the equator for the equinoxes , or a traditional date close to these times.

The following diagram shows the relation between the line of solstice and the line of apsides of Earth's elliptical orbit.

The orbital ellipse with eccentricity exaggerated for effect goes through each of the six Earth images, which are sequentially the perihelion periapsis—nearest point to the sun on anywhere from 2 January to 5 January, the point of March equinox on 19, 20 or 21 March, the point of June solstice on 20 or 21 June, the aphelion apoapsis—farthest point from the sun on anywhere from 4 July to 7 July, the September equinox on 22 or 23 September, and the December solstice on 21 or 22 December.

These "astronomical" seasons are not of equal length, because of the elliptical nature of the orbit of the Earth, as discovered by Johannes Kepler.

From the March equinox it currently takes The times of the equinoxes and solstices are not fixed with respect to the modern Gregorian calendar, but fall about six hours later every year, amounting to one full day in four years.

They are reset by the occurrence of a leap year. The Gregorian calendar is designed to keep the March equinox no later than 21 March as accurately as is practical.

Gregorian calendar seasonal error. The calendar equinox used in the calculation of Easter is 21 March, the same date as in the Easter tables current at the time of the Council of Nicaea in AD The calendar is therefore framed to prevent the astronomical equinox wandering onto 22 March.

From Nicaea to the date of the reform, the years , , , , , , , and , which would not have been leap years in the Gregorian calendar, amount to nine days, but astronomers directed that ten days be removed.

Currently, the most common equinox and solstice dates are March 20, June 21, September 22 or 23 and December 21; the four-year average slowly shifts to earlier times as the century progresses.

This shift is a full day in about years compensated mainly by the century "leap year" rules of the Gregorian calendar and as was a leap year the current shift has been progressing since the beginning of the last century, when equinoxes and solstices were relatively late.

This also means that in many years of the twentieth century, the dates of March 21, June 22, September 23 and December 22 were much more common, so older books teach and older people may still remember these dates.

On the other hand, people living far to the west America whose clocks run behind UTC may experience an equinox as early as March Over thousands of years, the Earth's axial tilt and orbital eccentricity vary see Milankovitch cycles.

The equinoxes and solstices move westward relative to the stars while the perihelion and aphelion move eastward. Thus, ten thousand years from now Earth's northern winter will occur at aphelion and northern summer at perihelion.

The severity of seasonal change — the average temperature difference between summer and winter in location — will also change over time because the Earth's axial tilt fluctuates between Smaller irregularities in the times are caused by perturbations of the Moon and the other planets.

Solar timing is based on insolation in which the solstices and equinoxes are seen as the midpoints of the seasons. It was the method for reckoning seasons in medieval Europe, especially by the Celts , and is still ceremonially observed in Ireland and some east Asian countries.

Summer is defined as the quarter of the year with the greatest insolation and winter as the quarter with the least. The solar seasons change at the cross-quarter days, which are about 3—4 weeks earlier than the meteorological seasons and 6—7 weeks earlier than seasons starting at equinoxes and solstices.

Thus, the day of greatest insolation is designated "midsummer" as noted in William Shakespeare 's play A Midsummer Night's Dream , which is set on the summer solstice.

On the Celtic calendar , the start of the seasons corresponds to four Pagan agricultural festivals - the traditional first day of winter is 1 November Samhain , the Celtic origin of Halloween ; spring starts 1 February Imbolc , the Celtic origin of Groundhog Day ; summer begins 1 May Beltane , the Celtic origin of May Day ; the first day of autumn is 1 August Celtic Lughnasadh.

The traditional calendar in China forms the basis of other such systems in East Asia. Its seasons are traditionally based on 24 periods known as solar terms.

These dates were not part of the traditional lunar calendar, however, and moveable holidays such as Chinese New Year and the Mid-Autumn Festival are more closely associated with the seasons.

Some calendars in south Asia use a six-season method where the number of seasons between summer and winter can number from one to three.

The dates are fixed at even intervals of months. In the Hindu calendar of tropical and subtropical India, there are six seasons or Ritu that are calendar-based in the sense of having fixed dates: Vasanta spring , Greeshma summer , Varsha monsoon , Sharad autumn , Hemanta early winter , and Shishira prevernal or late winter.

The six seasons are ascribed to two months each of the twelve months in the Hindu calendar. The rough correspondences are:.

The Bengali Calendar is similar but differs in start and end times. It has the following seasons or ritu:. The Tamil calendar follows a similar pattern of six seasons.

The Noongar people of South-West Western Australia also recognise maar-keyen bonar [18] , or six seasons. Each season's arrival is heralded not by a calendar date, but by environmental factors [19] such as changing winds, flowering plants, temperature and migration patterns and lasts approximately two standard calendar months.

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