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<p><b>New page</b></p><div>[[file:Dark_Moor_Autumnal.jpg|thumb|left]] '''Autumnal''' refers to anything related to the season of [[autumn]], also known as [[fall]] in some regions. This season is characterized by the transition from [[summer]] to [[winter]], typically marked by a gradual decrease in temperatures and the shedding of leaves from deciduous trees.<br />
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== Characteristics of Autumn ==<br />
Autumn is one of the four temperate [[seasons]], occurring between [[summer]] and [[winter]]. In the [[Northern Hemisphere]], it typically spans from late September to late December, while in the [[Southern Hemisphere]], it occurs from late March to late June.<br />
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=== Weather Changes ===<br />
During autumn, temperatures generally begin to drop, and the days become shorter. This is due to the tilt of the [[Earth's axis]] as it orbits the [[Sun]], resulting in less direct sunlight. The weather can vary significantly depending on the region, with some areas experiencing mild, pleasant conditions, while others may see early [[snowfall]] or increased rainfall.<br />
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=== Foliage ===<br />
One of the most notable features of autumn is the changing color of the leaves on deciduous trees. This phenomenon, known as [[autumn leaf color]], occurs as trees prepare for the winter months. The green pigment [[chlorophyll]] breaks down, revealing other pigments such as [[carotenoids]] and [[anthocyanins]], which produce yellow, orange, and red hues.<br />
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== Cultural Significance ==<br />
Autumn holds significant cultural importance in many societies. It is often associated with [[harvest]] festivals, such as [[Thanksgiving]] in the [[United States]] and [[Canada]], and the [[Mid-Autumn Festival]] in [[China]] and other parts of [[Asia]]. These festivals celebrate the gathering of crops and the abundance of the season.<br />
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=== Holidays and Festivals ===<br />
* [[Halloween]]: Celebrated on October 31st, Halloween is a popular holiday in many Western countries, characterized by activities such as [[trick-or-treating]], costume parties, and carving [[jack-o'-lanterns]].<br />
* [[Thanksgiving]]: A national holiday in the United States and Canada, Thanksgiving is celebrated with a feast that typically includes [[turkey]], [[stuffing]], and other traditional dishes.<br />
* [[Mid-Autumn Festival]]: Also known as the Moon Festival, this holiday is celebrated in many East Asian countries with mooncakes, lanterns, and family gatherings.<br />
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== Flora and Fauna ==<br />
Autumn is a time of preparation for many plants and animals. Deciduous trees shed their leaves to conserve water and energy, while many animals begin to store food or migrate to warmer climates. Some animals, such as [[bears]], enter a state of [[hibernation]] to survive the colder months.<br />
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== Health and Medicine ==<br />
The change in weather during autumn can have various effects on human health. Common issues include seasonal allergies, colds, and the onset of [[Seasonal Affective Disorder]] (SAD), a type of depression related to changes in seasons.<br />
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== See Also ==<br />
* [[Equinox]]<br />
* [[Season]]<br />
* [[Winter]]<br />
* [[Spring]]<br />
* [[Summer]]<br />
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== References ==<br />
{{Reflist}}<br />
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== External Links ==<br />
{{Commons category|Autumn}}<br />
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[[Category:Seasons]]<br />
[[Category:Autumn]]<br />
[[Category:Weather]]<br />
[[Category:Climate]]<br />
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