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From Nicaea to the date of the reform, the years 500, 600, 700, 900, 1000, 1100, 1300, 1400, and 1500, which would not have been leap years in the Gregorian calendar, amount to nine extra days, but astronomers directed that ten days be removed. 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. Thus the time from the March equinox to the September equinox is 7.56 days longer than from the September equinox to the March equinox. From the March equinox it currently takes 92.75 days until the June solstice, then 93.65 days until the September equinox, 89.85 days until the December solstice and finally 88.99 days until the March equinox. The precise timing of the seasons is determined by the exact times of the Sun reaching 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. He points out that the lengths are not equal, being 91 (in non-leap years), 94, 91, and 89 days for spring, summer, autumn, and winter, respectively.
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- The low angle of the 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.
- Many indigenous people who no longer live directly off the land in traditional often nomadic styles, now observe modern methods of seasonal reckoning according to what is customary in their particular country or region.
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- 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.
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- Calendar-based reckoning defines the seasons in relative rather than absolute terms, so the coldest quarter-year is considered winter even if floral activity is regularly observed during it, despite the traditional association of flowers with spring and summer.
The North American Cree and possibly other Algonquian speaking peoples used or still use a 6-season system. Many indigenous people who no longer live directly off the land in traditional often nomadic styles, now observe modern methods of seasonal reckoning according to what is customary in their particular country or region. In Australia, some tribes have up to eight seasons in a year, as do the Sami people in Scandinavia.
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Halloween is one of the most widely celebrated holidays in US casinos, with festivities often lasting throughout the entire month of October. Summer is also a good time for deposit and free spin deals, especially around holidays like Independence Day. A quasiperiodicity is a more general, irregular periodicity.
Thus Russia, historically navally constrained when confined to using Arkhangelsk (before the 18th century) and even Kronstadt, has particular interests in maintaining and in preserving access to Baltiysk, Vladivostok, and Sevastopol. For navies, the presence of accessible ports and bases can allow naval operations during certain (variable) seasons of the year. Floral and animal activity variation near the equator depends more on wet/dry cycles than seasonal temperature variations, with different species flowering (or emerging from cocoons) at specific times before, during, or after the monsoon season. Each season’s arrival is heralded not by a calendar date, but by environmental factors such as changing winds, flowering plants, temperature and migration patterns and lasts approximately two standard calendar months. The Noongar people of South-West Western Australia recognise maar-keyen bonar, or six seasons.
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- From the March equinox it currently takes 92.75 days until the June solstice, then 93.65 days until the September equinox, 89.85 days until the December solstice and finally 88.99 days until the March equinox.
- Seasonal reckoning in the military of any country or region tends to be very fluid and based mainly on short to medium term weather conditions that are independent of the calendar.
- A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region.
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In Europe, this is related to the English concept of Midsummer, High Summer or the Dog days, and related also to Spanish distinctions between primavera, estío and verano. 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. On the other hand, people living far to the west (America), whose clocks run behind UTC, may experience an equinox as early as March 19. People living farther to the east (Asia and Australia), whose local times are in advance, see the astronomical seasons apparently start later; for example, in Tonga (UTC+13), an equinox occurred on September 24, 1999, a date on which the equinox will not fall again until 2103. All the times are given in UTC (roughly speaking, the time at Greenwich, ignoring British Summer Time).
In China, a common temperature-based reckoning holds that it is winter for the period when temperatures are below 10°C on average and summer for the period when temperatures are above 22°C on average. In Finland, “permanently” is defined as when the mean daily averaged temperature remains above or below the defined limit for seven consecutive days. As noted, a variety of dates and even exact times are used in different countries or regions to mark changes of the calendar seasons.
The actual dates for each season vary by climate region and can shift from one year to the next. Six ecological seasons can be distinguished without fixed calendar-based dates like the meteorological and astronomical seasons. So, if a change in daily floral and animal events can be observed, the season is changing. The six seasons are ascribed to two months each of the twelve months in the Hindu calendar.
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Such non-seasonal fluctuations are usually due to economic conditions and are often related to the “business cycle”; their period usually extends beyond a single year, and the fluctuations are usually of at least two years. In time series data, seasonality refers to the trends that occur at specific regular intervals less than a year, such as weekly, monthly, or quarterly. Any modern war of manoeuvre profits from firm ground – summer can provide dry conditions suitable for marching and transport, frozen snow in winter can also offer a reliable surface for a period, but spring thaws or autumn rains can inhibit campaigning.
