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| Grishma (summer)
| Grishma (summer)
| Guda (jaggery)
| Guda (jaggery)
|-
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== Epidemic or diseases affecting communities (Janamara) ==
<div style='text-align:justify;'>The concept of seasonal regimens is applied to understand epidemics, their spread and favourable factors for their transmission. If the specific climatic characteristics are not observed in a season or abnormal features are observed, then it can be an alarming sign of an epidemic. Abnormal climatic conditions can favor the transmission of diseases. For example, when in any particular region, the cloud does not rain in rainy season, but rains in the winter season; it is in such times of seasonal derangement that the epidemic or the killer diseases of population commences or sets forth its activities. [Bhe. Sa. Sutra Sthana 13/8] </div>
=== Remedies for epidemic: ===
<div style='text-align:justify;'>During the epidemic, one shall follow fasting, keep high mental strength by avoding negative emotions, engage himself in offering worships, prayers, saluting the preachers (brahmin) and requisite inchantations of (mantras) and drugs. [Bhe. Sa. Sutra Sthana 13/9] </div>
=== Autumnal fever: ===
<div style='text-align:justify;'>Body is unable to cope up with suddent climatic changes. By sudden increase in heat at the end of the rainy season, pitta gets mobilized and aggravated. This leads to fever that occurs mostly in the early winter. This is called sharada jvara or autumnal fever. [Bhe. Sa. Sutra Sthana 13/10] </div>
=== Prevention of occurrences of diseases : ===
<div style='text-align:justify;'>Taking honey habitually in rainy season, ghee in autumn , varuni (a type of alcohol preparation) with gandhaka in shishira (late winter), grape juice in spring and drinking milk in summer prevent the occurrence of diseases due to seasonal variations. [ Bhe. Sa. Sutra Sthana 14/16-17] </div>
== Importance of ritucharya ==
<div style='text-align:justify;'>Kala or time constantly makes change in everything, so it is also known as ‘parinama’. This change brings abnormality or excellences of all substances including dosha, dhatu and rasa etc. This kala is the cause for division of seasons (ritu vibhaga), which directly influences the body strength (deha bala), and digestion (agni bala) etc. So, if one who follows the regimens prescribed under each and every ritu, such person is never afflicted with seasonal diseases. He always remains as a healthy person. [Yogaratnakara 1/830] </div>
== Division of seasons ==
<div style='text-align:justify;'>Season is defined as a division of the year.<ref>Definition of seasons- www.memam-webster.com Retrieved 27 April 2018.</ref> It is based on the changes in weather, ecology and the number of daylight hours in a given region. Seasons are the result of earth’s orbit around the Sun and Earth’s axial tilt relative to the ecliptic plane.<ref>Khavrus, V.; Shelevytsky, I. (2010). "Introduction to solar motion geometry on the basis of a simple model". Physics Education. 45 (6): 641–653. Bibcode:2010PhyEd..45..641K. doi:10.1088/0031-9120/45/6/010. S2CID 120966256. Archived from the original on 2016-09-16. Retrieved 2011-05-13.</ref> In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the earth’s surface, variations of which may cause animals to undergo hibernation or to migrate and plants to be dormant. various cultures define the number and nature of seasons based on regional variations. As such there are a number of both ,modern and historical cultures with varied number of seasons. The northern hemisphere experiences more direct sunlight during May, June and July as the hemisphere faces the sun. The same is true of the southern hemisphere in November, December and January. It is earth’s axial tilt that causes the sun to be higher in the sky during the summer months, which inceases the solar flux. However due to seasonal lag, June, July and August are the warmest months in the northern hemisphere. While December, January and February are the warmest months in the southern hemosphere. In temperate and sub-polar regions four seasons based on the Gregorian calendar are generally recognized spring, summer, autumn and winter. .
<br/>The Year is divided in to six season(six ritu)
{| class="wikitable"
! Solstice
! Indian season (Ritu)
! Month as per Hindu calender
! English month
! English Season
|-
|rowspan="3" | '''Nothern solstice (Adanakala/Uttarayana kala)'''
| Shishira
| Magha–Phalguna
| Mid January - Mid March
| Late winter
|-
| Vasanta
| Chaitra Vaishakha
| Mid March - Mid May
| Spring
|-
| Grishma
| Jyeshtha Ashadha
| Mid May – Mid July
| Summer
|-
|rowspan="3" | '''Southern solstice (Visarga kala/Dakshinayana)'''
| Varsha
| Shravan a Bhadrapada
| Mid July - Mid September
| Rainy / monsoon
|-
| Sharad
| Ashwini Kartika
| Mid September - Mid November
| Atumn
|-
| Hemanta
| Margashirsha Pushya
| Mid November - Mid January
| Early winter
|-
|-
|}
|}