With every two mäsa (months) commencing with magha, are the six Ritus ( seasons ) sira, vasanta, grima, var, and hima ( hemanta ) successively; the three commencing with sisira ( iira, vasanta, and grisma) form the Uttaiyaiia (northern solastice ); also known as Adna kala because the sun takes away the strength of the people daily.
Notes :—The months and seasons can be explained as follows :—
Mgha and Phalguna
(mid-January to mid.March) (cold, dewy season)
Caitra and Vaiakha Vasanta rtu
(mid-March to mid-May) (spring season)
Jyestha and Asăc1ha Grisma tu
(mid-May to mid-July) (summer eason)
The above three rtus (seasons) form uttaräyaia (northern solastice) or AdAnkăla ( debilitating period).
Avaia and Bhădrapada Varsa rtu
(mid July to mid-September) (rainy season)
vayuja and Kărtika arat rtu
(mid-September to mid-November) (autumn season)
MArgaira and Paua Hemanta rtu
(mid-November to mid-January) (winter season)
These three pus form DaksiitAyaia ( southern solastice) or visarga kăla ( strengthening period).


Uttarajaija (northern solastice)

Because of the nature of the path, both the sun and wind become very strong (powerful) and dry during this ayana (uttarayarja) and take aay all the cooling qqlities of the earth; tikta ( bitter ), kaaya ( astiiigcnt ) and katuka ( pungent ) tastes are moie powerful respectively (in the three successive rtus ), hence this adana kala is ägneya ( predominantly fire-like in nature). 3—4
Notes :—.Tikta ( bhter taste ) is powerful in gilira (cold, winter season), kaAya ( astringent) in vasanta ( spring) and kaçu (pungent) in grishma (summer ).