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Seasonal year

In today's world, Seasonal year has become a topic of increasing interest to a wide spectrum of society. With the advancement of technology and globalization, Seasonal year has acquired unprecedented relevance in various areas, from politics to culture, economy and society in general. The importance of understanding and analyzing Seasonal year lies in its impact on multiple dimensions of daily life, as well as its implication in the future of humanity. In this article, we will explore the different facets of Seasonal year and examine its influence on the world today.

The seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, or the flowering of a species of plant.

The need for farmers to predict seasonal events led to the development of calendars. However, the variability from year to year of seasonal events (due to climate change or just random variation) makes the seasonal year very hard to measure. This means that calendars are based on astronomical years (which are regular enough to be easily measured) as surrogates for the seasonal year. For example, the ancient Egyptians used the heliacal rising of Sirius to predict the flooding of the Nile.

A study of temperature records over the past 300 years suggests that the seasonal year is governed by the anomalistic year rather than the tropical year. This suggestion is surprising because the seasons have been thought to be governed by the tilt of the Earth's axis (see Effect of sun angle on climate). The two types of years differ by a mere 4 days over 300 years, so Thompson's result may not be significant. However, the result is not unreasonable. The seasons can be considered to be an oscillating system driven by two inputs with slightly different frequencies: the total input of energy from the sun varies with the anomalistic year, while the distribution of this energy between the hemispheres varies with the tropical year. In other physical situations, oscillating systems driven by two similar frequencies can latch onto either one. One point that must be considered is that the oscillation arising from the tilt of the axis is much greater than that arising from the distance of the sun.

See also

References

  1. ^ Thomson, David (1995-04-07). "The Seasons, Global Temperature, and Precession". Science. 268 (5207): 59–68. Bibcode:1995Sci...268...59T. doi:10.1126/science.268.5207.59. PMID 17755231. S2CID 34475254.


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